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Acute cholecystitis is an inflammatory condition of the gallbladder, characterized by infection, ulceration, and neutrophilic infiltration of the gallbladder wall. Approximately 90% of cases are caused by gallstones. In contrast, acalculous cholecystitis is defined as the inflammation of the gallbladder in the absence of gallstones during diagnosis. The causes of acalculous cholecystitis include impaired blood flow to the gallbladder, chemical injury, bacterial or parasitic infections, and collagen vascular diseases. However, in this case, it was caused by an extremely rare condition: a duodenal ulcer penetration. Physical examination, blood tests, and ultrasound suggested a diagnosis of acute cholecystitis. However, contrast-enhanced CT showed no gallstones and revealed a partial mucosal defect in the first portion of the anterior duodenum. There was also wall thickening and increased density of the surrounding fat tissue, particularly around the gallbladder wall adjacent to the first portion of the anterior duodenum. Based on these findings, secondary cholecystitis due to perforation of a duodenal ulcer was diagnosed, and laparoscopic cholecystectomy with omental patching was performed. Although rare, a duodenal ulcer should be considered as a cause of acalculous cholecystitis., Competing Interests: The authors have declared that no competing interests exist., (Copyright © 2024, Konagaya et al.)

This case report describes the atypical presentation of Wilson's disease in a 17-year-old male with sickle cell trait AS pattern. The patient initially presented with fever, generalized weakness, and joint pain, leading to an inconclusive diagnosis and unsuccessful initial treatment. A comprehensive re-evaluation revealed vitamin-A deficiency, adenoid hypertrophy, splenomegaly, and acalculous cholecystitis. Elevated copper levels in the 24-hour urine test confirmed the diagnosis of Wilson's disease. Treatment was modified to include amikacin, prednisolone, and Zinconia®, with analgesics for joint pain management. This case emphasizes the need for a thorough diagnostic approach and consideration of overlapping conditions in complex presentations, contributing to improved patient outcomes., Competing Interests: The authors have declared that no competing interests exist., (Copyright © 2023, Jain et al.)

Epstein-Barr virus (EBV), a member of the Herpesviridae family, is widely distributed and highly prevalent worldwide. It is known to cause infectious mononucleosis, characterized by symptoms such as fever, pharyngitis, lymphadenopathy, and atypical lymphocytosis in adults. In the pediatric population, acute EBV infection is typically asymptomatic.  Acute cholecystitis, on the other hand, refers to acute inflammation within the gallbladder, typically due to the obstruction of the cystic duct secondary to gallstones. Patients will often present with right upper quadrant pain positive for Murphy sign, among other manifestations such as fever, fatigue, and jaundice. EBV and acute cholecystitis rarely coincide with one another. This abstract presents a comprehensive analysis of a clinical case that illustrates how an EBV infection obscured the clinical presentation of acute cholecystitis. This case underscores the necessity for a nuanced approach to the diagnosis, especially when the standard of care diagnostic criteria become inconclusive. However, hepatocellular injury as a result of EBV infection is rare. In this case report, we present the case of a 19-year-old male who developed EBV-induced hepatitis, emphasizing the importance of considering EBV as a potential cause in similar clinical scenarios., Competing Interests: The authors have declared that no competing interests exist., (Copyright © 2023, Barkho et al.)

At its onset, coronavirus disease 2019 (COVID-19) commonly presents with generalized myalgia and upper respiratory symptoms. COVID-19 presenting as acalculous cholecystitis has been rarely described in the literature. The following case presents a patient whose first presentation of COVID-19 was acalculous cholecystitis without respiratory symptoms, critical illness, or severe COVID-19 infection., Competing Interests: The authors have declared that no competing interests exist., (Copyright © 2023, Bakshi et al.)

Gallbladder volvulus is a very rare complication of a congenital defect in gallbladder development also known as a "floating" gallbladder and often presents in the elderly. Proposed aetiologies include loss of abdominal fat and kyphoscoliosis. We present a patient with severe lumbar scoliosis centred on L2, producing a lumbar vertebral distortion of about 30 degrees concave to the right, resulting in right hemiabdomen volume loss. The mechanical interaction between the gallbladder fundus and compressed viscera transmits abnormal ambulatory forces from the distorted right pelvic brim into the abdomen predisposing to gallbladder torsion. Laparoscopic cholecystectomy was performed without complication and the patient had an uneventful recovery. This case demonstrates the challenges of diagnosing gallbladder torsion preoperatively. A high level of clinical suspicion is vital especially in elderly patients to enable timely surgical intervention to reduce morbidity and mortality., Competing Interests: The authors have declared that no competing interests exist., (Copyright © 2023, Sidhu et al.)

In this study, we present a case of Behcet's colitis that caused acute inflammation in the gallbladder and mimicked the clinical picture of an acute abdomen: severe right-sided abdominal pain, nausea, fever, and tenderness in the right hypochondrium, right flank, right loin, and right iliac fossa (RIF), with severely elevated white blood cell (WBC) count. The picture of acute acalculous cholecystitis and acute abdomen was resolved after three days of antibiotic therapy. Then, the pain mainly was localized in the right flank and loin, with mild pain in the right iliac fossa, with positive Rovsing's and psoas signs. The pain in the right flank, loin, and RIF dramatically subsided after initiating a low dose of steroid injections. The colonoscopy, which was performed after the marked improvement of the patient's general condition, showed large, deep ulcers with severe colitis in the proximal transverse colon and the ascending colon. There was no cobblestone appearance. The histopathology of the colonoscopic biopsy showed surface ulceration with marked inflammatory infiltrates, mainly neutrophils, and no granulomas were found. The acid-fast bacillus (AFB) test was reported negative. Detailed history-taking, repeated clinical examinations, laboratory studies, and careful interpretation of ultrasound (US) and contrast-enhanced computed tomography (CECT) findings may prevent unnecessary surgical interventions in such fragile patients and lead to a better prognosis. A diagnosis of Behcet's colitis was made, taking into consideration the patient's past medical history, mucocutaneous lesions, and US, CECT, colonoscopic, and histopathology findings. Although there are no specific investigations and tests for Behcet's colitis, sparing of the rectosigmoid area, the absence of cobblestone appearance, the presence of deep, large round ulcers, patchy localization of the lesions, the absence of granulomas, and negative AFB are helpful for confidently excluding other specific colitis such as Crohn's disease, ulcerative colitis, intestinal tuberculosis (TB), diverticulitis, and ischemic colitis. In our view, in the differential diagnosis of the non-surgical cause of acute abdomen, Behcet's colitis must be considered among other rare causes, such as inferior myocardial infarction, diabetic ketoacidosis, sickle cell disease, familial Mediterranean fever, and acute intermittent porphyria, especially for the population of Mediterranean coast and Middle East countries., Competing Interests: The authors have declared that no competing interests exist., (Copyright © 2022, Bakirli et al.)

Acute acalculous cholecystitis (AAC) represents gallbladder inflammation without evidence of gallstones. This typically results from gallbladder stasis and/or ischemia, which then causes a local inflammatory response within the wall. The condition is typically multifactorial and seen in critically ill patients, with associated risk factors that include trauma, burns, infections, total parenteral nutrition, and surgery. We present the case of a patient with acute-on-chronic hepatitis C infection leading to AAC., Competing Interests: The authors have declared that no competing interests exist., (Copyright © 2022, Gaisinskaya et al.)

Hyperthyroidism primarily presents with the symptoms and signs of thyrotoxicosis. However, many cases might present with a precipitating factor that unmasks the hyperthyroid status of the patients. These factors are associated with a stress condition, with infections being the most common factors, diabetic ketoacidosis, acute coronary syndrome, and pulmonary embolism. We present a case of hyperthyroidism masqueraded as acalculous cholecystitis., Competing Interests: The authors have declared that no competing interests exist., (Copyright © 2021, Elhaj et al.)

Though a rare event, gallbladder perforation (GBP) can occur in children and adolescents in the absence of pre-existing cholelithiasis. Moreover, type 1 perforation is seldom found in this cohort. Vague clinical presentation and inconclusive routine investigations can often result in delayed diagnosis. Computed tomography (CT) and intraoperative diagnosis should be utilized to timely diagnose and prevent fatal outcomes. Here, we present a rare case of type 1 GBP in an otherwise healthy 15-year-old boy with no known underlying etiology. Our purpose is to emphasize that although rare, a high clinical suspicion of GBP should be kept in mind even when dealing with acute abdomen in a pediatric population for preventing associated mortality., Competing Interests: The authors have declared that no competing interests exist., (Copyright © 2021, Ajmal et al.)

Epstein-Barr virus (EBV) infection with associated acute acalculous cholecystitis (AAC) has been reported in 18 pediatric patients. Our case is that of a seven-year-old girl with acute EBV infection and associated AAC., Competing Interests: The authors have declared that no competing interests exist., (Copyright © 2021, Rein et al.)

It is rare for acalculous cholecystitis to present with symptoms outside the abdomen; hence, making its diagnosis can be a challenge. We report a case of a 77-year-old male, with a relevant past medical history of left knee arthroplasty two years prior, who presented with left knee pain and swelling. Cultures from the arthrocentesis grew Clostridium perfringens , which led to a search for the source of infection. The right upper quadrant (RUQ) ultrasound (US) showed an enlarged gallbladder filled with sludge, but no cholelithiasis or secondary ultrasound findings were present to suggest acute cholecystitis. A computed tomography (CT) scan showed a distended gallbladder with diffuse gallbladder wall thickening and no stone but with suspicion for acalculous cholecystitis. A subsequent hepatobiliary (HIDA) scan confirmed the diagnosis of acalculous cholecystitis. Subsequently, the patient had a biliary drain placed. Bile cultures grew gram-positive rods consistent with Clostridium perfringens , confirming the source. With regards to the septic prosthetic joint, the patient underwent irrigation and debridement with polyethylene exchange without replacement of the prosthesis. The patient was also treated with six weeks of intravenous (IV) ertapenem (1 gram daily) and 12 months of moxifloxacin (400 mg daily). He had a cholecystectomy later and his symptoms were completely resolved., Competing Interests: The authors have declared that no competing interests exist., (Copyright © 2019, Zafar et al.)

We describe a case of melioidosis presenting as acalculous cholecystitis in a middle-aged Chinese male. The patient presented with clinical features of cholecystitis and computed tomography (CT) imaging did not reveal other obvious sources of sepsis other than acalculous cholecystitis. The decision was made by the hepatobiliary team to proceed with an urgent cholecystectomy in view of patient's septic presentation. Cultures from peripheral blood and intraoperatively obtained bile fluid grew Burkholderia pseudomallei.  The patient subsequently completed one month of meropenem, followed by another three months of eradication therapy. The patient denied soil contact in his work but he comes from a melioidosis-endemic country. He was also newly diagnosed with diabetes mellitus during his admission. We believe this to be the first reported case of melioidosis presenting as acalculous cholecystitis with a positive bile fluid culture. Urgent cholecystectomy in susceptible cases, with positive contact history or from endemic countries, might present another modality to achieve source control. Appropriate antibiotics with melioidosis coverage should be started early as well., Competing Interests: The authors have declared that no competing interests exist.

Infectious mononucleosis is a common disease of the adolescent caused by the Epstein-Barr virus (EBV). We present a rare case of a male adult with acalculous cholecystitis due to infectious mononucleosis. A correct diagnosis was challenging due to a false negative antibody test. Laboratory values were significant for a marked lymphocytosis and an early Immunoglobulin G (IgG) response without initial Immunoglobulin M (IgM) elevation. However, IgM antibodies were elevated two weeks later. Symptoms resolved quickly under symptomatic therapy. Antibody level patterns in asplenic patients with infectious mononucleosis are characterized by an atypical course with a delayed rise in IgM antibodies, which complicates the correct diagnosis of an EBV-induced acalculous cholecystitis., Competing Interests: The authors have declared that no competing interests exist.

Acute acalculous cholecystitis is an uncommon disease in children and is usually associated with trauma, burns, and infections. Whereas acute acalculous cholecystitis is only seen in 10% of cholecystitis in adults, it is uncommon in the paediatric population. A seven-year-old male presented to the emergency department of a regional hospital with a 36-hour history of right-upper-quadrant abdominal pain. He had associated symptoms of anorexia, nausea, and vomiting. He was septic with raised white cell count and inflammatory markers. Diffuse gallbladder wall thickening without intraluminal sludge or calculi was seen on abdominal ultrasound. He was found to have a concurrent right-upper lobe pneumonia on further investigation. The patient was treated with antibiotics and responded well to supportive and conservative management with close radiological monitoring. Acute acalculous cholecystitis is associated with a high mortality rate (30%) and significant complications such as gangrene, empyema, and perforation in 40% of adult cases. Acute surgical management has been traditionally advocated, however, surgery is not without risks; studies have suggested that non-operative intervention may be appropriate for selected critically ill children with an underlying cause. Herein, we discuss the safe and effective conservative treatment of acute acalculous cholecystitis in lieu of operative management and highlight the importance of recognising this disease in paediatric patients with acute abdominal pain and coexisting infection., Competing Interests: The authors have declared that no competing interests exist.

Acalculous cholecystitis (AC) is an inflammation of the gallbladder in the absence of gallstones. There are many risk factors associated with AC. However, this report implicates allopurinol as an inciting agent for a severe systemic drug reaction, i.e., the drug reaction with eosinophilia and systemic symptoms (DRESS) syndrome complicated by AC. We report a Chinese woman who presented on two occasions with a diffuse maculopapular rash, elevated liver enzymes, and upper abdominal pain attributable to acute AC, the second episode of which developed after the reintroduction of allopurinol treatment for gout. The AC complicated the DRESS syndrome during the course of her hospitalization., Competing Interests: The authors have declared that no competing interests exist.