Gallstones present as acute calculus cholecystitis in about 20% of individuals with symptomatic disease, having a wide range of symptom severity. The adult population is most often affected in about 10-15% within the developed countries. This is a 75-year-old man that was referred for a confirmatory ultrasonography from a peripheral health centre on account of an entertained ileocecal tumor following an abdominal ultrasound scan done in a local health care facility. The patient had an abdominal ultrasonography that showed an impacted calculus in the infundibulum of the gallbladder measuring about 30mm x 30mm in dimension with associated distended gall bladder; this shows thick and trabeculated wall, heterogenous content with circumferential hypoechoic halo of acute cholecystitis. The patient had percutaneous cholecystectomy in the peripheral care facility and was reported to have done considerably well for discharge. We report the ultrasonographic findings of acute calculus cholecystitis due to its peculiarity and presentations.