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Background: Pneumocystis pneumonia (PCP) is a common opportunistic infection caused by Pneumocystis jirovecii. Its incidence at 2 years or more after liver transplant (LT) is < 0.1%. PCP-related spontaneous pneumothorax and/or pneumomediastinum is rare in patients without the human immunodeficiency virus, with an incidence of 0.4-4%., Case Presentation: A 65-year-old woman who had split-graft deceased-donor LT for primary biliary cirrhosis developed fever, dyspnea and dry coughing at 25 months after transplant. Her immunosuppressants included tacrolimus, mycophenolate mofetil, and prednisolone. PCP infection was confirmed by molecular detection of Pneumocystis jirovecii,in bronchoalveolar lavage. On day-10 trimethoprim-sulphamethoxazole, her chest X-ray showed subcutaneous emphysema bilaterally, right pneumothorax and pneumomediastinum. Computed tomography of the thorax confirmed the presence of right pneumothorax, pneumomediastinum and subcutaneous emphysema. She was managed with 7-day right-sided chest drain and a 21-day course of trimethoprim-sulphamethoxazole before discharge., Conclusion: Longer period of PCP prophylaxis should be considered in patients who have a higher risk compared to general LT patients. High index of clinical suspicion, prompt diagnosis and treatment with ongoing patient reassessment to detect and exclude rare, potentially fatal but treatable complications are essential, especially when clinical deterioration has developed.

Background: Subcutaneous emphysema of a limb after acute injury is classically associated with gas gangrene. Delayed management can result in amputation and death. Typically caused by a clostridial infection, patients are unwell, with rapidly spreading clinical signs, abnormal laboratory results, and cultures positive. There are reports of widespread subcutaneous emphysema of a limb in well-appearing patients, with blood parameters within normal limits; however, the optimum management of this type of case is unclear., Objective: Our objectives were to present 4 new cases of acute subcutaneous emphysema in well-appearing patients managed with early surgery, review the literature, and discuss the management decisions in cases of acute subcutaneous emphysema in clinically well patients., Case Reports: Here we present a case series of 4 patients, all with penetrating injuries to the upper limb resulting in widespread subcutaneous emphysema within 24 h of injury. Mean age was 33 years. All were fit and well, with the exception of one with type 1 diabetes, no cardiorespiratory compromise, and no significant derangement of laboratory investigations. X-ray studies showed widespread gas within the soft tissues. All were treated aggressively with immediate surgical fasciotomy of the upper limb, thorough debridement, and washout as required. Gram stains revealed pus cells (polymorphonuclear leucocytes) in all, but organisms in only one case (Gram-positive cocci and bacilli). Prolonged culture grew organisms in all. All patients had a second washout and closure plus 6 weeks of antibiotics. All survived and had fully functioning limbs. Why should an emergency physician be aware of this? We recommend having a low threshold for rapid referral to an appropriate surgical speciality, allowing prompt and radical surgical management of this type of presentation, even in the presence of a well patient., (Copyright © 2014 Elsevier Inc. All rights reserved.)

Subcutaneous emphysema involving the upper limb can result from infection with gas-producing microorganisms or from a variety of non-infective causes. This case illustrates the reflections that should be made in such cases to avoid over- or undertreating the patient.

Pneumorachis has previously been described only after spread from a contiguous site or after a traumatic event. Our patient experienced sepsis due to multiple enteric organisms, and gas was identified within the spinal canal on computed tomographic imaging. We present the 1st case of pneumorachis caused by disseminated infection.

Subcutaneous emphysema after laparoscopic surgery is not uncommon but infection of the subcutaneous space because of gas forming organisms causing emphysema after a laparoscopic procedure is an extremely rare entity. We report a case of infective subcutaneous emphysema after laparoscopic rectopexy.

Clostridium perfringens is a rare, life-threatening infection. We present an atypical evolution of spontaneous Clostridium perfringens myonecrosis in a monitored healthy patient. After a head injury, the hemodynamically stable patient became febrile and grew cultures of Clostridium perfringens with no identifiable focus. Antibiotics were initiated. Seventy-two hours after culture results, the patient complained of shoulder pain and imaging revealed periscapular subcutaneous emphysema. Multiple surgical débridements of the necrotic supraspinatus muscle were required to eradicate the infection. The unique features of this patient include the opportunity to (1) follow the progression of clostridial myonecrosis in a healthy patient in a monitored setting and (2) study the extended period of time between positive cultures and the onset of clinical myonecrosis, a feature at odds with the classic rapid progression.

We present a case of recurrent cutaneous nocardiosis following a high pressure air injection injury which was treated conservatively. The patient subsequently developed multiple chronic granulomatous nodules in the palm and dorsum of the hand requiring repeated surgical debridements and long term antibiotics for complete resolution. Some reports suggest that high pressure injection injuries of air or water run a benign course and may be treated conservatively. However, inoculation by high pressure injection injury of air or water may result in chronic infections, which cause significant morbidity and are a therapeutic challenge. Although uncommon, they may be avoided by adherence to established treatment principles which include prompt recognition, realisation of its severity and aggressive treatment by open wound management, even for seemingly innocuous trauma or inoculum.

A previously healthy 13-year-old boy developed extensive subcutaneous emphysema of the lower limb after a penetrating injury to the knee. Clostridium perfringens was isolated from the wound. Despite surgical debridement and appropriate antibiotics, the emphysema recurred, and prolonged antibiotic treatment was required. This case highlights the distinction between gas gangrene and the lesser known entity of clostridial crepitant cellulitis.

The association between invasive Clostridium septicum infection and colorectal carcinoma is examined by the presentation of three cases and a review of the literature. In the first two cases the patients presented with nontraumatic metastatic clostridial gas gangrene. In the third case a patient with chemotherapy-induced myelosuppression from concomitant multiple myeloma had a necrotizing transmural infection of the right colon. The apparent portal of entry of Clostridium septicum was an occult carcinoma of the ascending colon. The increasing evidence for a strong link between this organism and some cases of neutropenic enterocolitis is reviewed.

Nonclostridial cellulitis with concomitant gas formation in the plantar tissues of the foot is seldomly reported in the literature. The event itself, however, may actually be relatively common. A review of the literature and a case study involving a diabetic patient is presented, along with a review of the etiology, diagnosis, and treatment.