2019 Volume 33 Issue 5 Pages 854-861
A 70-year-old woman was diagnosed as having GAD antibody-positive cerebellar ataxia. One year later, her symptoms had not improved despite treatment with steroid administration. Plane computed tomography (CT) for suspected paraneoplastic syndrome revealed a gallbladder polyp with calcification. Abdominal ultrasonography (US) depicted a low-echo tumor of 12mm at the inferior portion of the gallbladder. Enodoscopic US showed a high-echo margin, low-echo center, and disruption of the outer layer of the gallbladder. Contrast CT revealed the polyp as gradually stained, with the gallbladder wall protruding into the liver floor. A diagnosis of gallbladder cancer with liver floor infiltration was made. However, subsequent cholecystectomy and partial resection of the liver floor disclosed histological findings of fibrous tissue covered by simple epithelium for a final diagnosis of a fibrous polyp of the gallbladder. This is a rare case in which fibrous tissue from the gallbladder invaded the liver floor.
