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The Epstein-Barr virus (also known as EBV), responsible for infectious mononucleosis, is a virus that infects the majority of the world's population. Infection occurs in several forms, most often asymptomatic, or as a fever accompanied by pharyngitis and lymphadenopathies. A rare complication of infectious mononucleosis is acute acalculous cholecystitis, an inflammation of the gallbladder characterized by ischaemia and severe cholestasis. The diagnosis of this pathology is made by imaging, but determining the cause may be tricky. We present here the case of acute acalculous cholecystitis in a 21-year-old woman. This case highlights a rare complication of EBV infection that is probably under-diagnosed, and demonstrates the usefulness of interpreting liver tests and leukocyte count in association with imaging findings.

Introduction. Takayasu’s arteritis or pulseless disease is a systemic inflammatory disease of an unknown etiology, affecting medium and large arteries and their branches, leading to stenosis, occlusions, or aneurysmal degeneration. It is more frequent in young Asian women. Case presentation. We present a rare case of Takayasu’s disease in a young woman, who initially developed an acute ischemic cholecystitis. Ischemia is one of the mechanisms involved in the pathogenesis of acute acalculous cholecystitis. As this mechanism is most often involved in elderly people, such an uncommon finding at young age should be a reason to suspect a vasculitis with small vessel occlusion. Conclusions. Acute cholecystitis in this patient was the first onset sign of Takayasu’s arteritis. An acute acalculous cholecystitis at young age could be of ischemic origin and should also be considered as a possible epiphenomenon of a generalized vasculitis disease.

Nontyphoidal salmonella are a rare case of acute acalculous cholecystitis. Salmonella Paratyphi B, which accounts for one of the less invasive NTS serotypes, has rarely been reported to cause cholecystitis. We describe a case of 65-year old previously healthy man, who present with signs of acute abdomen, due to biliary peritonitis as a complication of acute acalculous cholecystitis caused by Salmonella paratyphi B. Our case illustrates the potential severity of infection with Salmonella Paratyphi B especially in older patient. High index of awareness should be considered in endemic areas.