Abstract
A 43-year-old man was found to have liver dysfunction in a health check-up in 2008. Ultrasonography revealed hepatic steatosis and a 5 x 4 mm pedunculated lesion within the gallbladder. The patient was diagnosed with a cholesterol polyp and underwent ultrasonographic follow-up annually. There was no change in the polyp until 2013, when it had increased in size to 7 x 4 mm. In 2014, ultrasonography showed further enlargement to 9 x 6 mm and as well as acoustic shadowing. Computed tomography performed the same day revealed calcification of the polyp. Ultrasonography performed in 2015 showed a mobile, 6-mm gallstone and there was only a small pedunculated lesion at the site where the polyp originally had been detected. We believe that the cholelithiasis most likely resulted from degeneration of the polyp, which would represent a very rare occurrence.
