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Since their introduction in 1987, hydroxymethyl glutaryl coenzyme A reductase (HMG-CoA) inhibitors, more commonly known as statins, have become some of the most widely prescribed medications in the world. Though generally considered to be safe and well tolerated, statins have been associated with several side effects including mild liver dysfunction manifested by increases in aminotransferases. Rarely, statins have been noted to induce more serious hepatic injury, including liver injury with autoimmune features. Current literature supports statin induced liver injury presenting in either hepatocellular or cholestatic patterns, though with the former being the prevailing pattern of injury. Fortunately, severe liver injury is uncommon with statin use and is generally reversible without any intervention other than offending statin cessation. When evaluating cases of suspected statin-induced liver injury, a complete medical history, laboratory tests including a complete metabolic panel, autoimmune markers, and viral panel, as well as hepatic imaging, are crucial for a complete causality analysis with validated tools such as Roussel Uclaf Causality Assessment Method. The aim of this review is to review the current evidence for statin-induced liver injury and cholestasis.

Hepatitis C (HCV) is a viral infection that affects an estimated 71 million people worldwide, with over 1 million new infections yearly. While medical treatments exist, HCV continues to be a significant public health concern. Primary prevention and transmission risk factor identification remain key in helping decrease disease prevalence. While intravenous drug use, healthcare exposure (i.e. blood transfusions and surgical care), and body modification (i.e. tattooing and piercings) are well accepted risk factors for HCV transmission, others remain controversial. Because dental practice is often associated with procedures and bleeding, the possibility of HCV transmission seemed reasonable to investigate. Here, we review the evidence for dental care as a potential risk factor for HCV transmission. We identified a total of 1,180 manuscripts related to HCV and dental care, of which 26 manuscripts were included in the study after exclusionary criteria were applied. As per our review of the available literature, in the developing world, the improper use of sterile technique and lack of provider education likely increases the risk of HCV transmission during dental care. In developed nations, on the other hand, general dental care does not appear to be a significant risk factor for HCV transmission in non-intravenous drug user patients; although, the improper use and reuse of anesthetics during procedures poses a rare potential risk for viral transmission.

This chapter covers the following conditions: gut malabsorption, enzyme deficiencies, lactase deficiency, lactase, vitamin B12, vitamin B12 deficiency, pernicious anemia, and small intestinal bacterial overgrowth. This chapter includes drug class, brand/trade names, manufacturer, dosage, indications, contraindications/cautions, adverse effects, drug interactions, pregnancy advice, lactation safety, relative cost of rifaxamin, amoxicillin-clavulanate, neomycin, tetracycline, doxycycline, trimethoprim-sulfamethoxazole, ciprofloxacin, norfloxacin, metronidazole, probiotics, prebiotics, synbiotics, short bowel syndrome, proton pump inhibitors, octreotide, histamine-2 receptor antagonists, clonidine, tincture of opium, teduglutide, cholestyramine, somatropin, and exenatide. This chapter includes convenient algorithms for the treatment of small bowel bacterial overgrowth and short bowel syndrome.

This chapter covers the following conditions: acute pancreatitis and chronic pancreatitis. This chapter includes drug class, brand/trade names, manufacturer, dosage, indications, contraindications/cautions, adverse effects, drug Interactions, pregnancy advice, lactation safety, relative cost of tramadol, hydromorphone, gabapentin, amitriptyline, duloxetine, octreotide, celiac/splanchnic nerve block.

Achalasia is an esophageal motility disorder characterized by a lack of peristalsis and an increased lower esophageal sphincter pressure that does not relax with swallowing. High-resolution manometry (HRM), a valuable diagnostic tool for esophageal disorders, often comes with software for automated study interpretation. Although helpful, there are certain caveats in the diagnostic criteria for achalasia which the software may miss. We highlight 2 patients in whom software analysis of HRM studies resulted in misdiagnosis of achalasia as manometrically detected nonachalasia esophagogastric junction outflow obstruction and emphasize the importance of manual interpretation of HRM data by clinicians.

Biliary atresia (BA) is a childhood disease which manifests with abnormal narrowing, blockage or complete absence of bile ducts within the liver. Many possible etiologies have been reported for the development of BA, including congenital, perinatal and acquired conditions. Since the 1970’s, there has been increasing evidence linking BA development to viral perinatal infections. The viral vectors most commonly implicated include members of the herpesviridae family (cytomegalovirus and Epstein-Barr virus) as well as those of the reoviridae family (reovirus and rotavirus). While extensive work has been done on a murine model of disease, the current review focuses primarily on evidence from human studies of viral vectors in children afflicted with BA.

Autoimmune hepatitis (AIH) is a cause of chronic, immune-mediated liver injury which without treatment may progress to end-stage liver disease. The disease state, characterized by elevations in liver enzymes, autoantibodies, and interface hepatitis on histology, has been noted to be induced by a wide range of insults. Medications, most commonly minocycline and nitrofurantoin, have long been established as potential inducers of AIH. Recently, biologics, powerful immune-modulators, have also been reported to induce AIH. We conclude that there is an association between administration of biologics in the development of AIH, and whether the relationship is causal will require appropriate studies in the future.

Metastatic oculocutaneous melanoma is a malignant process most commonly identified in the lungs, bone, gastrointestinal tract (most frequently the liver), and brain. In most cases, the primary oculocutaneous lesion responsible for the metastases is identified. However, in very rare cases, patients present with metastatic lesions with an occult primary site, termed melanoma of unknown primary (MUP), secondary to the partial or complete regression of the primary lesion. We describe the case of an 89-year-old male whose initial diagnosis of achalasia was later identified to be MUP in the cardia of the stomach with protrusion into the esophagus.

Biliary mucinous cystadenomas are cystic neoplasms commonly mistaken for simple cysts. They are rare and generally benign tumors, often incidentally found on imaging and during unrelated surgical interventions. They tend to be slow growing though may reach symptomatic dimensions. Misdiagnosis of biliary mucinous cystadenomas may have serious consequences secondary to their potential for malignant transformation into biliary mucinous cystadenocarcinomas. Here, we review the epidemiology, etiology, pathology, diagnostic modalities, histology, and available treatment methods for mucinous cystadenomas reported in current literature.

Clostridium difficile (CD), a bacterium responsible for causing 15%-25% of all cases of infectious diarrhea, is most commonly associated with infection of the colon. Rarely, though with increasing frequency, it has been noted to infect the small intestine in what is referred to as CD enteritis. We present the case of a patient who was diagnosed and treated for CD enteritis, review the pathophysiology behind the infection, and discuss the diagnostic and treatment options available to healthcare professionals.

Enterovesicular fistulas (EVFs) are abnormal connections between the colon and the urinary bladder. They are estimated to account for one in every 3,000 surgical hospital admissions and are rarely associated with long-standing Crohn's colitis. We present an interesting case of a 93-year-old man with a long-standing history of Crohn's colitis on mesalamine, whose mechanical fall at home lead to the discovery of a colovesicular fistula with invading urothelium concerning for squamous cell carcinoma.

Pancreatitis in both acute and chronic variants is a common health concern in the US as well as globally. While the most common etiologies for disease remain gallstone impaction in the common bile duct and alcohol abuse, recent studies have shown that genetics may play a significant role as well. Unfortunately, this correlation is not clearly defined and at present, we lack the ability to identify which patients with known pancreatic genetic polymorphisms will develop pancreatitis. We describe the case of a middle-aged male who presented with recurrent pancreatitis in the setting of the serine peptidase inhibitor, Kazal type 1 (SPINK-1) genetic polymorphism. Additionally, we discuss the mechanism behind SPINK-1 polymorphisms in the development of pancreatitis as well as the role of genetic screening for the polymorphism in the general population.

Peritoneal tuberculosis (PTB), although rarer than its pulmonary counterpart, is a serious health concern in regions of the world with high tuberculosis prevalence. Individuals with baseline immunocompromise condition, whether acquired or medically induced, are at greatest risk for experiencing PTB. While medical treatment of the condition is similar to that of the pulmonary disease, the generally immunocompromised state of those infected with PTB, along with a lack of highly sensitive and specific testing methods make early diagnosis difficult. This review discusses the risks factors, clinical features, diagnostic methods, and treatment options for PTB.

Hepatic angiosarcoma (HA) accounts for 2% of primary liver tumors. Though rare, it is exceptionally deadly. The initial presentation of HA is nonspecific and no tumor markers have been associated with it. In general, liver function is maintained until later stages of the disease, often leading to diagnosis once the disease is already advanced or metastatic. In this report, we present the case of a 54-year-old male whose vague symptoms and non-diagnostic liver biopsy delayed the diagnosis of a rapidly progressing HA.

Acute esophageal necrosis (AEN) is a particularly rare syndrome with an incidence of only 0.1-0.28%, whose appearance is notable for proximal extensions of black, necrotic appearing mucosa extending proximally in the esophagus and abruptly interrupted at the gastroesophageal junction. In this case series, we explore the cases of two males: one middle-aged and one elderly, who after presenting with emesis, were found to have acute esophageal necrosis on esophagogastroduodenoscopy.