This female patient had a CT to evaluate a renal cyst (seen on the left). Indeterminate gallbladder appearance was found with a suspicion of an inflammatory process or a tumor. Clinicians decided to evaluate this patient in abdominal MR with cholangiopancreatographic sequences. 

Final diagnosis of gallbladder adenomyomatosis can be made with certainty noting the characteristic findings - intramural cystic diverticula with lumen narrowing without any nodular enhancing content (pearl necklace sign).