We report a case of acalculous cholecystitis in an AIDS patient, that appeared with insidious onset, abdominal right upper quadrant pain and fever. Cholecystectomy was performed and CMV inclusions were observed in tissue sections. CMV acalculous cholecystitis is an uncommon condition associated to the acquired immunodeficiency syndrome. It should be considered, especially when abdominal pain and fever are present in marked immunosuppressed AIDS patients. Unfortunately, a limited experience in treatment, either medical or surgical, was reported. In our case, the response to surgical procedure was successful, disappearing the abdominal pain and the fever. The patient refused both ganciclovir and foscarnet therapy.