Marked gallbladder wall thickening caused by Epstein–Barr virus‐induced infectious mononucleosis

Key Clinical Message In patients with symptoms of viral infection and marked thickening of the gallbladder wall, it is important to suspect acalculous cholecystitis due to Epstein–Barr virus‐induced infectious mononucleosis. Abstract A 35‐year‐old Japanese man presented with fever, abdominal right upper quadrant pain, and liver dysfunction. Positive immunoglobulin M and ‐G antibodies and negative nuclear antigen for Epstein–Barr virus were observed. Abdominal ultrasonography revealed a markedly thickened gallbladder wall. Acalculous cholecystitis due to Epstein–Barr virus‐induced infectious mononucleosis was diagnosed.