Biliary Granular Cell Tumor

Granular cell tumor (GCT) is a benign neoplasm showing neuroectodermal differentiation and is most commonly found in the head and neck region, including the tongue [1]. This tumor is now believed to occur in virtually any site of the body, including skin, breast, and gastrointestinal tract, with less than 1% developing in the biliary tract [2]. To our knowledge, only one case of GCT of the biliary tract has been reported in Korea, which occurred in the gallbladder [3]. Herein, we present another case of GCT of the biliary tract.