Arnold Cheung MD, Presenter: Nothing to Disclose

Daniel Kowal MD, Abstract Co-Author: Nothing to Disclose

Adenomyomatosis of the gallbladder is a common, benign entity with classic features on ultrasound, CT and MRI. However, it is often under-recognized and misdiagnosed leading to further imaging and unwarranted surgery. This abstract presents key imaging features every radiologist needs to know for prompt and accurate recognition of these lesions.

There are 3 types of adenomyomatosis: diffuse, segmental, and localized. The diffuse form shows diffuse mural thickening and luminal narrowing. The segmental form demonstrates focal thickening with an “hourglass” appearance. Although dysplasia and carcinoma may arise, these are due to chronic inflammation and gallstones, not adenomyomatosis itself. The localized form appears as a focal, mass analogous to that of a physiologic ovary. All forms demonstrate a highly specific “pearl necklace" sign.

Adenomyomatosis is a common disease with typical features on CT, MR and ultrasound. Prompt recognition of such lesions would avoid un-necessary follow-up and potential surgical resection of this benign condition.

Cheung, A, Kowal, D, Adenomyomatosis: A Common But Often Under Recognized and Misdiagnosed Imaging Entity.  Radiological Society of North America 2010 Scientific Assembly and Annual Meeting, November 28 - December 3, 2010 ,Chicago IL. http://archive.rsna.org/2010/9015609.html