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BACKGROUND: Amebic liver abscess is an extraintestinal manifestation of Entamoeba histolytica infection. Pleural empyema, secondary to rupture of amebic liver abscess, is an uncommon complication of Entamoeba histolytica infection. CLINICAL CASE: A 38-year-old male patient with a history of alcoholism presented to the emergency department with abdominal pain and dyspnea of several weeks of evolution. A chest-X-ray revealed right-sided massive pleural effusion. The aspirated pus was anchovy paste color; active Entamoeba histolytica trophozoites were visualized under the microscope. CONCLUSIONS: Health care providers should think of pleuropulmonary amebiasis in patients presenting with right-sided thoracic complains in certain clinical scenarios (alcoholic males and malnourished individuals). [ABSTRACT FROM AUTHOR]

Background: Liver abscess is one of the hepatobiliary manifestations of inflammatory bowel disease (IBD) that has been scarcely described in the literature. Objectives: To conduct a scoping review to provide a detailed description of the occurrence of hepatic abscess in patients with IBD and summarize the observed clinical features. Methodology: Searches were carried out using relevant keywords in Medline (via PubMed) and Web of Science from inception until June 13, 2022. Only articles that reported the occurrence of hepatic abscess in patients with IBD were included. Results: Forty-eight publications (40 case reports and 8 case series) were included, representing 73 patients with IBD who were radiologically or intraoperatively diagnosed with hepatic abscess. Patients with Crohn's disease were more predisposed to developing hepatic abscess than patients with ulcerative colitis (79.5% vs. 20.5%, respectively). Furthermore, pyogenic liver abscess was found to be more prevalent (57.9%) compared with aseptic (38.7%) and amebic (3.2%) abscesses. No clear relation was found between death or prolonged hospital stay in terms of the clinical presentation or management plan, as mortality was reported in different age groups with different managements. Conclusion: To date, there is no consensus regarding the appropriate management of hepatic abscess as an extraintestinal manifestation of IBD. However, the condition shares several features with liver abscess diagnosed among the general population. [ABSTRACT FROM AUTHOR]

Amebiasis is an intestinal infection caused by Entamoeba histolytica. Amebic liver abscess (ALA) is the most common extraintestinal complication of amebiasis. In animal models of ALA, neutrophils have been shown to be the first cells to come into contact with Entamoeba histolytica during the initial phase of ALA. One of the multiple mechanisms by which neutrophils exhibit amebicidal activity is through reactive oxygen species (ROS) and the enzyme NADPH oxidase (NOX2), which generates and transports electrons to subsequently reduce molecular oxygen into superoxide anion. Previous reports have shown that ROS release in the susceptible animal species (hamster) is mainly stimulated by the pathogen, in turn provoking such an exacerbated inflammatory reaction that it is unable to be controlled and results in the death of the animal model. Apocynin is a natural inhibitor of NADPH oxidase. No information is available on the role of NOX in the evolution of ALA in the hamster, a susceptible model. Our study showed that administration of a selective NADPH oxidase 2 (NOX2) enzyme inhibitor significantly decreases the percentage of ALA, the size of inflammatory foci, the number of neutrophils, and NOX activity indicated by the reduction in superoxide anion (O2−) production. Moreover, in vitro, the apocynin damages amoebae. Our results showed that apocynin administration induces a decrease in the activity of NOX that could favor a decrease in ALA progression. [ABSTRACT FROM AUTHOR]

Background: Pleural empyema secondary to a ruptured amoebic liver abscess is a rare complication in the pediatric population. Case report: We report the case of a 13-year-old male with right flank abdominal pain, productive cough with foul-smelling sputum, fever, and respiratory distress. Physical examination revealed breathlessness, decreased vesicular murmur in the right hemithorax, abdominal distension, hepatomegaly, and lower limb edema. Laboratory tests revealed mild anemia, leukocytosis without eosinophilia, elevated alkaline phosphatase, hypoalbuminemia, and positive immunoglobulin G antibodies against Entamoeba histolytica in pleural fluid. He required a chest tube and treatment with metronidazole. After 2 months of follow-up, the abscesses disappeared, and the empyema decreased. Conclusions: Massive pleural empyema secondary to a ruptured liver abscess is a rare complication. The epidemiological link associated with the symptoms and serological tests can help in the diagnosis. [ABSTRACT FROM AUTHOR]

Background: Liver abscess is one of the hepatobiliary manifestations of inflammatory bowel disease (IBD) that has been scarcely described in the literature. Objectives: To conduct a scoping review to provide a detailed description of the occurrence of hepatic abscess in patients with IBD and summarize the observed clinical features. Methodology: Searches were carried out using relevant keywords in Medline (via PubMed) and Web of Science from inception until June 13, 2022. Only articles that reported the occurrence of hepatic abscess in patients with IBD were included. Results: Forty-eight publications (40 case reports and 8 case series) were included, representing 73 patients with IBD who were radiologically or intraoperatively diagnosed with hepatic abscess. Patients with Crohn's disease were more predisposed to developing hepatic abscess than patients with ulcerative colitis (79.5% vs. 20.5%, respectively). Furthermore, pyogenic liver abscess was found to be more prevalent (57.9%) compared with aseptic (38.7%) and amebic (3.2%) abscesses. No clear relation was found between death or prolonged hospital stay in terms of the clinical presentation or management plan, as mortality was reported in different age groups with different managements. Conclusion: To date, there is no consensus regarding the appropriate management of hepatic abscess as an extraintestinal manifestation of IBD. However, the condition shares several features with liver abscess diagnosed among the general population.

Liver infections are a common and appropriate management depends on the accurate diagnosis. Imaging is an important part of the workup of patients with suspected liver infections. The imaging appearances depend on the causative agent. When imaging features are seen in context of the clinical presentation, biochemical features, and predisposing condition, a specific diagnosis is possible in a significant proportion of patients. In this review, we discuss the imaging-based approach to liver infections. [ABSTRACT FROM AUTHOR]

Surgical emergencies are common in the critical care setting and require prompt diagnosis and management. Here, we discuss some of the surgical emergencies involving the gastrointestinal, hepatobiliary, and genitourinary sites. In addition, foreign body aspiration and necrotizing soft-tissue infections have been elaborated. Clinicians should be aware of the risk factors, keys examination findings, diagnostic modalities, and medical as well as surgical treatment options for these potentially fatal illnesses. [ABSTRACT FROM AUTHOR]

Situs inversus totalis, a rare congenital condition, is characterized by the mirror-image reversal of the abdominal and thoracic organs. Amoebic liver abscess and emphysematous gallbladder are severe gastrointestinal infections. The coexistence of these three conditions is extremely rare. We present the case of a 65-year-old male who presented with abdominal pain, fever, and jaundice. Investigations revealed situs inversus totalis, amoebic liver abscess, and emphysematous gallbladder. The patient underwent successful treatment with antibiotics and open surgery drainage of the liver abscess, and subtotal cholecystectomy. The co-occurrence of situs inversus totalis, amoebic liver abscess, and emphysematous gallbladder poses a diagnostic challenge and requires thorough evaluation and appropriate management. Situs inversus totalis may coincide with other conditions like amebic abscess and emphysematous gallbladder, complicating diagnosis and treatment. Early diagnosis and prompt intervention are crucial to improve outcomes. • Situs inversus totalis is a rare congenital condition characterized by the complete mirror-image reversal of organs. • The presence of surgical gastrointestinal disease in a patient with situs inversus presents a surgical challenge. • Medical team should collaborate in diagnosing and treating gastrointestinal illnesses in a patient with situs inversus. [ABSTRACT FROM AUTHOR]

Unintentional overuse of commonly prescribed medications can prove catastrophic. A 30-year-old man presented with difficulty in speaking and walking since 10 days. Examination revealed ataxic gait and bilateral cerebellar signs. During a recent admission for amoebic liver abscess, he was managed with the percutaneous aspiration of abscess and metronidazole which he continued for more than 2 weeks. During the current presentation, brain imaging showed confluent hypodensities in the bilateral dentate nucleus suggestive of metronidazole toxicity. Two weeks after discontinuation of the offending agent, the patient improved clinically with complete radiological resolution of lesions.

Background. Amebic liver abscess (ALA) caused by Entamoeba histolytica is usually diagnosed based on its clinical symptoms, medical imaging abnormalities of the liver, and serological tests, the most common being the enzyme-linked immunosorbent assay (ELISA). For more than three decades, no investigation has evaluated the diagnostic performance of immunoglobulin G (IgG) subclasses in the serodiagnosis of ALA. Herein, we assessed the efficiencies of anti-amebic IgG and IgG subclasses for diagnosing ALA. Methods. A serological ELISA-based test was performed to assess its diagnostic performance using a total of 330 serum samples from ALA patients (nD14), healthy individuals (nD40), and patients with other diseases (nD276). Results. ELISA targeting the total IgG antibody to E. histolytica antigen exhibited 100% sensitivity 95% CI [76.8-100.0] and 97.8% specificity 95% CI [95.5-99.1], whereas the assay targeting IgG1 showed the same sensitivity (100% 95% CI [76.8-100.0]) and a slightly higher specificity (99.1% 95% CI [97.3-99.8]). The other IgG subclasses (IgG2, IgG3, and IgG4) displayed a lower sensitivity and specificity. The sensitivity and specificity did not significantly differ between tests measuring total IgG and IgG1 (Exact McNemar's test; p > 0.05), with a concordance of 98.2%, represented by a Cohen's kappa of 0.83 (p < 0.001), indicating almost perfect agreement. Conclusion. ELISA targeting IgG1 can provide valuable information to clinicians in differentiating ALA from other parasitic diseases, cancers, cirrhosis, and viral hepatitis. However, enzyme-conjugated anti-human total IgG is cheaper than anti-human IgG subclasses. Therefore, we suggest that total IgG-based ELISA is sufficient for the routine serodiagnosis of human ALA and possibly other clinical manifestations of invasive amebiasis. [ABSTRACT FROM AUTHOR]

Background Amebic liver abscess (ALA) caused by Entamoeba histolytica is usually diagnosed based on its clinical symptoms, medical imaging abnormalities of the liver, and serological tests, the most common being the enzyme-linked immunosorbent assay (ELISA). For more than three decades, no investigation has evaluated the diagnostic performance of immunoglobulin G (IgG) subclasses in the serodiagnosis of ALA. Herein, we assessed the efficiencies of anti-amebic IgG and IgG subclasses for diagnosing ALA. Methods A serological ELISA-based test was performed to assess its diagnostic performance using a total of 330 serum samples from ALA patients (n = 14), healthy individuals (n = 40), and patients with other diseases (n = 276). Results ELISA targeting the total IgG antibody to E. histolytica antigen exhibited 100% sensitivity 95% CI [76.8–100.0] and 97.8% specificity 95% CI [95.5–99.1], whereas the assay targeting IgG1 showed the same sensitivity (100% 95% CI [76.8–100.0]) and a slightly higher specificity (99.1% 95% CI [97.3–99.8]). The other IgG subclasses (IgG2, IgG3, and IgG4) displayed a lower sensitivity and specificity. The sensitivity and specificity did not significantly differ between tests measuring total IgG and IgG1 (Exact McNemar’s test; p > 0.05), with a concordance of 98.2%, represented by a Cohen’s kappa of 0.83 (p < 0.001), indicating almost perfect agreement. Conclusion ELISA targeting IgG1 can provide valuable information to clinicians in differentiating ALA from other parasitic diseases, cancers, cirrhosis, and viral hepatitis. However, enzyme-conjugated anti-human total IgG is cheaper than anti-human IgG subclasses. Therefore, we suggest that total IgG-based ELISA is sufficient for the routine serodiagnosis of human ALA and possibly other clinical manifestations of invasive amebiasis.

Amebiasis is an intestinal infection caused by Entamoeba histolytica. Amebic liver abscess (ALA) is the most common extraintestinal complication of amebiasis. In animal models of ALA, neutrophils have been shown to be the first cells to come into contact with Entamoeba histolytica during the initial phase of ALA. One of the multiple mechanisms by which neutrophils exhibit amebicidal activity is through reactive oxygen species (ROS) and the enzyme NADPH oxidase (NOX2), which generates and transports electrons to subsequently reduce molecular oxygen into superoxide anion. Previous reports have shown that ROS release in the susceptible animal species (hamster) is mainly stimulated by the pathogen, in turn provoking such an exacerbated inflammatory reaction that it is unable to be controlled and results in the death of the animal model. Apocynin is a natural inhibitor of NADPH oxidase. No information is available on the role of NOX in the evolution of ALA in the hamster, a susceptible model. Our study showed that administration of a selective NADPH oxidase 2 (NOX2) enzyme inhibitor significantly decreases the percentage of ALA, the size of inflammatory foci, the number of neutrophils, and NOX activity indicated by the reduction in superoxide anion (O2−) production. Moreover, in vitro, the apocynin damages amoebae. Our results showed that apocynin administration induces a decrease in the activity of NOX that could favor a decrease in ALA progression.

Context: Amebic liver abscess (ALA) occurs in 3%–9% of the amebiasis cases, with complications seen in 20%–40% of the cases and 2%–18% mortality rate. Successful treatment thus requires the accurate identification of these cases. Aims and Objectives: We aimed to assess the seropositivity and profile of ALA patients in western Rajasthan. Materials and Methods: This retrospective study was conducted at a tertiary care center in western Rajasthan from November 2017 to May 2019. Serological diagnosis of ALA was done by detecting immunoglobulin G (IgG) antibodies in the serum of the patients by ELISA. The derangements in laboratory profile (hematological and biochemical parameters) and ultrasonography findings were assessed from the hospital records. Statistical analysis was performed using Mann–Whitney U-test. Results: Among the total cases (n = 34), 20 were diagnosed as ALA. Twenty-one (61.8%) were positive for anti-amebic IgG antibodies. Among ALA patients, 14 (70%) were >40 years old and only 6 (30%) patients were of age ≤40 years. Male: female ratio was 5.7:1, and ultrasonography records of 15 ALA patients revealed the presence of hepatomegaly (n = 7, 46.7%), pleural effusion (n = 3, 20%), lung collapse (n = 2, 13.3%), and vascular involvement (n = 1, 6.7%). The right lobe of the liver was involved in majority of the patients (n = 12, 80%). Total white blood cell count (P < 0.001), absolute neutrophil count (P = 0.001), total serum bilirubin (P = 0.019), and serum alkaline phosphatase (P = 0.018) were significantly elevated in ALA patients. Conclusions: Seroprevalence shows that ALA still remains the dominant etiology in liver abscess patients in this region. There are significant derangements in the laboratory profile that require a larger study for corroboration. [ABSTRACT FROM AUTHOR]

Background: Amebic liver abscess is the most common type of liver abscess on a worldwide basis, with caudate lobe being a relatively uncommon location for its occurrence. Abscess in caudate lobe of liver is often considered a challenging location for image-guided percutaneous drainage due to its difficult-to-access location along with close relationship with major vessels at porta hepatis. Purpose: This study aims to demonstrate safety and efficacy of percutaneous drainage for caudate lobe amebic abscess. Materials and methods: In this retrospective study, hospital database was electronically searched for patients having caudate lobe amebic abscess that underwent percutaneous catheter drainage/needle aspiration (PCD/PNA) between January 2016 and January 2021. The etiology, risk factors, microbiology, complications, different approaches for PCD/PNA, and their outcome were studied and reported. Results: Of 30 patients having caudate lobe amebic abscess treated with PCD/PNA, solitary caudate lobe abscess was seen in 29, whereas one patient had more than one abscesses in caudate lobe. Contained and free intraperitoneal rupture of the abscess were seen in 9 (30%) and one patient, respectively. Ten (32%) patients had associated vascular thrombosis, while 2 patients were found to have abscess-biliary communication. Twenty-six (86.7%) patients were treated with PCD, while remaining 4 (13.3%) with PNA. On Univariate analysis, factors such as volume, multilocularity, and contained rupture of the abscess were found to be significantly increasing the duration of percutaneous drainage (PCD), while only multilocularity (p value 0.007) continued to show statistical significance on Multivariate analysis. Venous thrombosis and duration of catheter drainage were the two factors found to have significant influence on the length of hospital stay on Univariate as well as Multivariate analysis (p value 0.05 and 0.001, respectively). The rates of catheter manipulation were also significantly higher in patients with abscess showing complex internal configuration (heteroechoic contents and/or multilocularity). Technical and clinical success rates of 100% and 96.7% were achieved through percutaneous interventions (PCD/PNA), despite the complex location of abscesses and associated complications, with no incidence of vascular injury. Conclusion: Liver abscess in caudate lobe can be accessed by different routes for percutaneous drainage, despite being surrounded by large vessels and its deep location, without major complications. Thus, PCD/PNA may be considered as a first-line therapy for the management of caudate lobe amebic abscesses in adjunct to medical therapy. [ABSTRACT FROM AUTHOR]

Unintentional overuse of commonly prescribed medications can prove catastrophic. A 30-year-old man presented with difficulty in speaking and walking since 10 days. Examination revealed ataxic gait and bilateral cerebellar signs. During a recent admission for amoebic liver abscess, he was managed with the percutaneous aspiration of abscess and metronidazole which he continued for more than 2 weeks. During the current presentation, brain imaging showed confluent hypodensities in the bilateral dentate nucleus suggestive of metronidazole toxicity. Two weeks after discontinuation of the offending agent, the patient improved clinically with complete radiological resolution of lesions. [ABSTRACT FROM AUTHOR]

The article presents case study of 49-year-old male with a remote history of alcohol use disorder presented with a 5-day history of subjective fever, nausea, vomiting, watery diarrhea, and right upper quadrant abdominal pain. It mentions diagnosis of Amoebic liver abscess and associated amoebic colitis.

Abstract Background Amebiasis is a rare condition in developed countries but epidemiologically growing. Clinical manifestation may range from asymptomatic to invasive disease, amoebic liver abscess being the most common manifestation. We report a peculiar case of left hepatic amoebic liver abscess in a patient without a well-known source of infection and presenting with left portal vein thrombosis. Case presentation Patient, working as longshoreman, presented with complaints of remittent-intermittent fever lasting from 2 weeks. Physical examination was normal. Blood tests showed mild anemia, neutrophilic leukocytosis and elevated inflammation markers. Chest x-rays was normal. Abdominal ultrasound showed multiple hypoechoic liver masses. CT-scan of abdomen showed enlarged left liver lobe due to the presence of large abscess cavity along with thrombosis of left portal vein. The indirect hemagglutination test for the detection of antibodies to Entamoeba histolytica (Eh) was positive. Ultrasound-guided percutaneous drainage revealed “anchovy sauce” pus. Metronidazole and a follow up imaging at 3 months showed resolution of abscess cavity. Conclusion This case shows that amoebic liver abscess is possible even in first world country patients without travel history. Left sided abscess and portal vein thrombosis are rare and hence reported.

Abstract Background Metronidazole (MNZ) has been clearly established as a medication for amebic liver abscess. In uncomplicated cases, surgical drainage should be avoided. We report a case of amebic liver abscess refractory to MNZ that was successfully treated using preoperative computed tomography (CT) and percutaneous and surgical drainage with intraoperative ultrasonography (IOUS). Case presentation A 53-year-old man with high-grade fever was diagnosed with a cystic lesion on his right hepatic lobe using CT. Percutaneous drainage was performed, and antibacterial drugs were administered. However, the infection and condition of the patient worsened. Entamoeba histolytica was detected from pus within the mediastinal cavity. Hence, the patient was diagnosed with amebic liver abscess. After the diagnosis was established, we administered MNZ for 10 days. Despite this, the patient’s physical condition did not improve. Blood tests suggested impending disseminated intravascular coagulation (DIC). We performed surgical intervention to drain the amebic liver abscess refractory to conservative treatment. During surgery, imaging information from preoperative CT and IOUS enabled us to recognize the anatomical structures and determine the incision lines of the hepatic capsule and hepatic tissue. The patient’s DIC immediately regressed after surgery. Unfortunately, malnutrition and disuse syndrome contributed to the patient’s long recovery period. He was discharged 137 days post-surgery. Conclusions We reported a case of amebic liver abscess refractory to conservative treatment. Surgical drainage with preoperative CT and IOUS allowed us to safely and effectively perform complex abscess decompression.

Amebic liver abscess (ALA) is a common condition in the developing world but is rare in the United States without a clear exposure risk. It is even less common to develop in an infant. The diagnosis of ALA can be logistically difficult and often requires invasive procedures and testing with slow turnaround times. We present an 18-month-old boy initially admitted with fever, abdominal pain, and diarrhea with rapid progression to respiratory failure. He was found to have a significant pleural effusion accompanying a large solitary liver lesion with abdominal ascites. There was no infectious exposure history or travel history, and thus pyogenic liver abscess was suspected, and aspiration performed while he was on empiric antimicrobials. The bacterial culture was negative. Molecular testing with 16 s and 18 s rRNA PCR on the fluid were non-diagnostic. The diagnosis of Entamoeba histolytica was confirmed within 48 hrs via plasma next-generation sequencing. Serum IgG for E histolytica resulted positive multiple weeks after the patient was discharged. The patient made a full recovery after metronidazole and paromomycin. This case illustrates the need to maintain ALA in the differential diagnosis for liver abscess in an infant even in the absence of risk factors. Additionally, plasma next-generation sequencing may play a role in more rapid diagnosis of ALA and has the potential to reduce the need for more invasive testing.

Background: Amebic liver abscess is treated successfully with metronidazole or another nitroimidazole drug followed by a luminal amebicide. Metronidazole has long been preferred, but has been associated with several adverse effects including intolerance in certain clinical situations. Mechanisms of metronidazole resistance and mutagenic potential have been described. Effects of the use of drug in pregnant women and infants of lactating women are unknown. Nitazoxanide was proven to be efficacious in treating invasive intestinal amebiasis. Therefore, the present study was undertaken to assess the efficacy and safety of nitazoxanide as compared to metronidazole in patients with uncomplicated amebic liver abscess. Methods: Patients with clinical and ultrasonography features suggestive of liver abscess, positive amebic serology, and/or anchovy sauce appearance on aspiration of the pus were included in the study and randomized into two parallel treatment groups. Group M received metronidazole, 2–2.5 g/day intravenous (IV), for inpatients, or 2–2.4 g/day oral, for outpatients in three divided doses for 14 days. Group N received nitazoxanide 500 mg BD per oral for 10 days. Results: A total of sixty subjects fulfilling the inclusion criteria were randomized equally into two groups, group M and group N. Number of patients achieving symptomatic clinical response (SCR) was similar in the two groups (80% vs. 76.7%, p = 1.00), though time to achieve symptomatic clinical response was significantly lower in metronidazole group as compared to that in nitazoxanide group. Greater proportion of patients achieved early clinical response (ECR) in metronidazole group as compared to nitazoxanide group. Complete resolution of abscess, at 6 months, was noted in 18 (60%) patients in the M group and 22 (73.3%) patients in the N group (p = 0.273). Metronidazole was associated with significantly greater frequency of adverse effects than nitazoxanide. Conclusions: This study shows equivalent efficacy of nitazoxanide in uncomplicated amebic liver abscess as compared to metronidazole, with better tolerability and advantage of simultaneous luminal clearance, thus reducing chances of recurrence. Trial registration: CTRI/2019/01/017249 [ABSTRACT FROM AUTHOR]

Objectives: Metronidazole is commonly used drug in almost all the fields of medicine. Commonly patients use medication for a shorter time than was prescribed, but in this report, the patients have used medication for long time based on ultrasound images. This study aims to assess metronidazolerelated neurotoxicity at this hospital. Material and Methods: All the patients with diagnosis of amebic liver abscess, who developed neurotoxicity with metronidazole, were evaluated retrospectively. Results: Ten patients with metronidazole neurotoxicity were seen from April 2017 to March 2019. All ten had peripheral neuropathy; one each had in addition cerebellar ataxia and new onset seizures. Conclusion: A preventable toxic effect with metronidazole has to be recognized early during drug therapy for hepatic amebic abscesses. A dose adjustment during therapy helps in preventing this neurotoxicity. The patients have to be educated that metronidazole should not be continued on ultrasound images. [ABSTRACT FROM AUTHOR]

Parasitic disorders affecting the liver in children include amebiasis, visceral leishmaniasis (Kala Azar), ascariasis, hepatic capillariasis, strongyloidiasis, toxocariasis, echinococcosis (hydatidosis), fascioliasis, schistosomiasis, clonorchiasis, and opisthorchiasis. Emphasis is placed on identifying the responsible parasite (i.e., protozoa, nematodes, cestodes, trematodes) along with principles of diagnosis, clinical symptomatology, and management. Clinicians should keep in mind that the liver is often affected by parasites, including those listed herein. [ABSTRACT FROM AUTHOR]

Amebic liver abscess (ALA) is still a common problem in the tropical world, where it affects over three-quarters of patients with liver abscess. It is caused by an anaerobic protozoan Entamoeba hystolytica , which primarily colonises the cecum. It is a non-suppurative infection of the liver consisting primarily of dead hepatocytes and cellular debris. People of the male gender, during their reproductive years, are most prone to ALA, and this appears to be due to a poorly mounted immune response linked to serum testosterone levels. ALA is more common in the right lobe of the liver, is strongly associated with alcohol consumption, and can heal without the need for drainage. While majority of ALA patients have an uncomplicated course, a number of complications have been described, including rupture into abdomino-thoracic structures, biliary fistula, vascular thrombosis, bilio-vascular compression, and secondary bacterial infection. Based on clinico-radiological findings, a classification system for ALA has emerged recently, which can assist clinicians in making treatment decisions. Recent research has revealed the role of venous thrombosis-related ischemia in the severity of ALA. Recent years have seen the development and refinement of newer molecular diagnostic techniques that can greatly aid in overcoming the diagnostic challenge in endemic area where serology-based tests have limited accuracy. Metronidazole has been the drug of choice for ALA patients for many years. However, concerns over the resistance and adverse effects necessitate the creation of new, safe, and potent antiamebic medications. Although the indication of the drainage of uncomplicated ALA has become more clear, high-quality randomised trials are still necessary for robust conclusions. Percutaneous drainage appears to be a viable option for patients with ruptured ALA and diffuse peritonitis, for whom surgery represents a significant risk of mortality. With regard to all of the aforementioned issues, this article intends to present an updated review of ALA., Competing Interests: Conflict-of-interest statement: All the authors report no relevant conflicts of interest for this article., (©The Author(s) 2024. Published by Baishideng Publishing Group Inc. All rights reserved.)

Introduction: An amebic liver abscess is the most common presentation of extraintestinal amebiasis. This condition is the result of a parasite infection caused by Entamoeba histolytica. Materials and Methods: We report a case of a 53-year-old male who presented with abdominal pain in the right upper quadrant, jaundice, and a 10-kg weight loss within a 1-month span. Results and Conclusion: A wide range of symptoms and findings in the imaging tests suggestive of neoplasia, elevated levels of CA 19-9 and CA 125, and the presentation of biliary peritonitis as a complication makes this case a challenge for its approach and management.

We present a case of amebic liver abscess in a patient with polycystic liver disease (PCLD). A 36-year-old woman was admitted to the hospital due to right upper quadrant pain for 8 months before the admission. She also had episodic diarrhea. At previous admission, she was diagnosed having liver abscess. In the present admission, the diagnosis of amebic liver abscess was made based on the characteristics of abscess, sterile abscess culture, and the presence of cysts and trophozoites of protozoa in the stools. The diagnosis of PCLD was established according to the Gigot and Schnelldorfer criteria. In conclusion, the diagnosis of amebic liver abscess in patient with PCLD requires a holistic investigation and comprehensive follow-up. [ABSTRACT FROM AUTHOR]

Background Amoebiasis is a prevalent infection in the tropics. Amoebic liver abscess is the most common extraintestinal manifestation. Cardiac tamponade is an uncommon complication of amoebic liver abscess that may need urgent pericardiocentesis. Case summary A 25-year-old man presented with abdominal pain and fever for 1 month. Abdominal ultrasound revealed a 4.7 × 4.7 cm abscess in the left lobe of the liver. Percutaneous pigtail drainage was performed to evacuate the abscess. After 2 days, the patient developed signs of cardiac tamponade and bilateral pleural effusion, requiring urgent pericardiocentesis and chest drain insertion. Persistent posterior collection of thick abscess in pericardium needed pericardial window for complete drainage. The patient recovered completely after pericardial window. There was no evidence of chronic constrictive pericarditis after 1 year of follow-up. Discussion A rare complication of the amoebic liver abscess was observed in this young adult who developed cardiac tamponade, requiring an urgent pericardiocentesis, and later requiring pericardial window. Management includes amoebicidal and luminicidal drugs for complete eradication of Entamoeba histolytica. [ABSTRACT FROM AUTHOR]

Amoebiasis, caused by Entamoeba histolytica, is one of the leading parasitic infections in the world. This study was aimed at profiling antigenic membrane proteins of a virulent variant of E. histolytica HM-1:IMSS. The membrane proteins were extracted using ProteoExtract® kit (Merck, Darmstadt, Germany) or conventional method, separated using OFFGEL 3100 fractionator (Agilent Technologies, Santa Clara, California), followed by SDS-PAGE and Western blot analysis. Selected antigenic membrane proteins were identified using LC-ESI-MS/MS. Subsequently, the proteins were classified according to their biological processes and predictions were made on membrane and membrane-associated proteins. When the proteins were probed with pooled sera from amoebic liver abscess (ALA) patients, 10 and 15 antigenic proteins with molecular weights 25 to 200 kDa were identified using the ProteoExtract® kit and conventional method, respectively. LC-ESI-MS/MS identified 13 antigenic proteins, and both extraction methods predicted six of them as membrane and membrane-associated proteins. The topmost biological processes which comprised of six proteins were involved in cellular processes.. These antigenic membrane proteins merit further investigations as potential candidates for vaccine studies. [ABSTRACT FROM AUTHOR]

Parasitic disorders affecting the liver in children include amebiasis, visceral leishmaniasis (Kala Azar), ascariasis, hepatic capillariasis, strongyloidiasis, toxocariasis, echinococcosis (hydatidosis), fascioliasis, schistosomiasis, clonorchiasis, and opisthorchiasis. Emphasis is placed on identifying the responsible parasite (i.e., protozoa, nematodes, cestodes, trematodes) along with principles of diagnosis, clinical symptomatology, and management. Clinicians should keep in mind that the liver is often affected by parasites, including those listed herein. [ABSTRACT FROM AUTHOR]

Background: Metronidazole (MNZ) has been clearly established as a medication for amebic liver abscess. In uncomplicated cases, surgical drainage should be avoided. We report a case of amebic liver abscess refractory to MNZ that was successfully treated using preoperative computed tomography (CT) and percutaneous and surgical drainage with intraoperative ultrasonography (IOUS).Case Presentation: A 53-year-old man with high-grade fever was diagnosed with a cystic lesion on his right hepatic lobe using CT. Percutaneous drainage was performed, and antibacterial drugs were administered. However, the infection and condition of the patient worsened. Entamoeba histolytica was detected from pus within the mediastinal cavity. Hence, the patient was diagnosed with amebic liver abscess. After the diagnosis was established, we administered MNZ for 10 days. Despite this, the patient's physical condition did not improve. Blood tests suggested impending disseminated intravascular coagulation (DIC). We performed surgical intervention to drain the amebic liver abscess refractory to conservative treatment. During surgery, imaging information from preoperative CT and IOUS enabled us to recognize the anatomical structures and determine the incision lines of the hepatic capsule and hepatic tissue. The patient's DIC immediately regressed after surgery. Unfortunately, malnutrition and disuse syndrome contributed to the patient's long recovery period. He was discharged 137 days post-surgery.Conclusions: We reported a case of amebic liver abscess refractory to conservative treatment. Surgical drainage with preoperative CT and IOUS allowed us to safely and effectively perform complex abscess decompression. [ABSTRACT FROM AUTHOR]

The parasitic infections by Entamoeba histolytica in human are in two forms, either pathogenic to some individuals or non-pathogenic to others; the pathogens that invade the tissues are called E. histolytica and non-pathogenic species are called E. dispar. Infections in temperate areas are often non-pathogenic, as most patients are infected with no clinical symptoms, unlike in tropical and subtropical regions where most of the infections in these areas are pathogenic and E. histolytica parasites are responsible for millions of cases of amoebic dysentery and amoebic abscess where the parasite is endemic. The symptoms of E. histolytica are divided into two types: intestinal, extra intestinal, the symptoms depend on two main factors: the first is the location of the parasite in the host and the other is the penetration or invasion of tissues of the host. The current study explained that there are several methods to diagnose parasite: Traditional methods using a microscope, serological methods and Molecular method. The best method is the molecular method because this method depended on the diagnosis for the genes of Entamoeba histolytica. [ABSTRACT FROM AUTHOR]

Purpose: To report venous thrombosis and associated perfusion defect in amebic liver abscess (ALA) using MDCT. Method: MDCT images of 62 patients with ALA were reviewed for venous thrombosis and associated perfusion abnormalities. Result: The study found 43 (69%) patients with venous thrombosis: portal vein thrombosis (PVT) occurred in 39, hepatic vein thrombosis (HVT) in 37 and inferior vena cava (IVC) thrombosis in 4. Combined PVT and HVT occurred in 33 (77%) patients. The portal vein thrombi remained localized in subsegmental branches in 25 patients and extended to segmental branches in 14. The hepatic vein thrombi were confined to peripheral branches in 18 patients; they progressed to the main trunk in 19 and to the IVC in 4. A wedge-shaped hypoattenuating zone suggesting ischemia was identified in 33 (77%) patients in portal phase: 31 had combined PVT and HVT, 2 had HVT alone, but none had PVT alone. It occurred significantly more often with combined PVT and HVT than HVT alone (p = 0.05). Arterial phase enhancement occurred in 2 of 13 patients with multiphasic CT. All patients were symptomatic despite medical therapy and therefore required percutaneous drainage. About half of the patients were identified with ruptured abscesses. Segmental atrophy was observed in seven of nine patients who underwent follow-up CT. Conclusion: Combined PVT and HVT commonly occur with ALA and often manifests as segmental hypoperfusion in portal venous phase, indicating ischemia. The detection of such events by CT may be indicative of severe disease that requires aggressive management involving percutaneous drainage. [ABSTRACT FROM AUTHOR]

Background and Aim: Although the mortality rate has declined in recent years, amoebic liver abscesses (ALAs) still carry a substantial risk of morbidity. Studies regarding the indicators of severity, complication, or prognosis of ALA are limited in number and heterogeneous in methodology and results. Methods: Clinicodemographic profile, therapeutic modalities, and outcomes of indoor ALA patients admitted between January 2016 and October 2017 were analyzed. An analysis of possible prognostic factors associated with complications and interventional therapy in patients with ALA was performed retrospectively. Results: Data of 198 patients with ALA (mean age: 45 ± 12.1; M:F ratio: 193:5) were analyzed. The volume of abscess (503.1 ± 391.2: 300.2 ± 305.8 mL), elevated liver enzymes, and duration of hospital stay (11.98 ± 5.75): 10.23 ± 4.1 days) were significantly (P < 0.05) higher in alcoholic, compared to nonalcoholic, individuals. On univariate analysis, older age, duration of alcohol consumption, smoking, leukocytosis, hyperbilirubinemia, hypoalbuminemia, hyponatremia, and a larger volume of abscess were found to be significantly (P < 0.05) associated with complications. On multivariate analysis, older age, duration of alcohol consumption, smoking, leukocytosis, hyperbilirubinemia, hypoalbuminemia, and hyponatremia were found to be significantly (P < 0.05) associated with complications. Male gender, hypoalbuminemia, and larger volume of abscess were significantly (P < 0.05) associated with interventional treatment. Conclusion: Older age, leukocytosis, hyperbilirubinemia, hypoalbuminemia, hyponatremia, chronic alcoholism, and smoking are independent factors significantly associated with complications in patients with ALA. Hypoalbuminemia, larger volume of abscess, and male gender are independent variables associated with the requirement of interventional therapy. [ABSTRACT FROM AUTHOR]

Background: The role of metronidazole alone, percutaneous aspiration (PA), and percutaneous catheter drainage (PCD) in the treatment of uncomplicated amebic liver abscess (ALA) is still unclear. This systematic review and meta-analysis evaluated the available evidences with regard to treatment modalities in such patients. Methods: The database was searched for relevant randomized controlled trials (RCTs) published until May 2019. All studies were assessed for risk of bias. The relevant data were pooled in a random or fixed-effect model to calculate the mean difference (MD) or relative risks. Results: After the detailed screening, 570 patients from 10 RCTs comparing metronidazole alone with metronidazole + PA were included. Most studies had uncertain risk of biases. Days to resolution of abdominal pain (MD − 1.59, 95% confidence interval [CI] − 2.77, − 0.42, I2 = 89%) and tenderness (MD − 1.76, 95% CI − 2.93, − 0.58, I2 = 72%) were significantly shorter in the metronidazole + PA group. There was no significant difference in relation to the resolution of fever, abscess size, and hospital stay. The beneficial effects of PA were seen with medium-to-large (> 5 cm) ALA and not with small (< 5 cm) ALA. Addition of PCD to metronidazole therapy was better than metronidazole alone in one low-quality RCT. Two RCTs found PCD to be better than PA for large ALA. Conclusions: Percutaneous aspiration as compared with metronidazole alone results in the early resolution of pain and tenderness in patients with medium-to-large ALA. Percutaneous catheter drainage is better for larger ALA. However, discrepancies in RCTs create therapeutic dilemmas necessitating further efforts to generate more reliable data. [ABSTRACT FROM AUTHOR]

Introduction: Amoebiasis is a disease caused by parasitic protozoan Entamoeba histolytica. The disease affects approximately 50 million people each year. The majority of cases come from subtropical and tropical regions with poor sanitation. The infection occurs when food or water contaminated by feces water is ingested. There are intestinal and extraintestinal forms, the most common of which is amebic liver abscess (ALA). The main symptoms of ALA are fever and pain in the right upper quadrant of the abdomen. The intestinal form of amoebiasis is treated pharmacologically with protozoal-killing drugs, while in ALA, additional drainage or percutaneous needle aspiration may be warranted. Case Report: A 74-year-old patient from Italy was admitted to the hospital in November 2023 due to anemia in the course of myelodysplastic syndrome with multilineage dysplasia. Abdominal ultrasound showed dilated bile ducts, an anechogenic lesion, and a low-echogenic structure (approximately 130 mm) with echogenic formations protruding inside. A contrast CT revealed a smooth-wall lesion measuring 125 mm in diameter filled with fluid of increased density. IgG antibodies for Echinococcus granulosus were positive. At the beginning of 2024, the patient, presenting with jaundice, pale stools, and dark urine, was admitted to the University Hospital. On physical examination, Chełmoński's sign was positive. Laboratory tests revealed ALT 133 U/l (<41 U/l), AST 114 (< 37 U/l), total bilirubin 20, 75 mg/dl (<1, 2 mg/dl), ALP 298 mg/dl (<120mg/dl), GGTP 557 U/l (<61 U/l). IgG antibodies for Entamoeba histolytica were positive. Contrast CT scan revealed bile ducts compressed by a cyst measuring 130x115x150 mm with dense content and a gas bubble. During drainage procedure, over 1, 5 liters of chocolate-colored fluid were drained. Based on laboratory findings and clinical presentation, the diagnosis of ALA was stated. Treatment with metronidazole, chloroquine, doxycycline, blood transfusion, and hydration was implemented, resulting in visible improvement in the patient's condition. Discussions : The patient resided in countries such as Italy and Poland. In Europe, most amoebiasis cases are imported from endemic regions. Symptoms can manifest even decades after returning from endemic areas. However, our patient denied traveling outside of Europe. On the other hand, transmission through sexual contact or by ingestion of imported food contaminated with amoeba cannot be ruled out in this case. Conclusions: Extraintestinal amoebiasis should be suspected in travelers with abdominal pain and focal liver lesions returning from the Mediterranean area, including Italy. [ABSTRACT FROM AUTHOR]

Liver abscess with biliary communication poses management problem if percutaneous drainage is performed. We report a case of large amoebic liver abscess (ALA) with jaundice. Prolonged high‑output bile drainage after percutaneous drainage of ALA showed suspicion of communication of abscess with intrahepatic bile ducts (biliary fistula). The same was managed successfully with endoscopic biliary stent placement with medical management.