[A Resected Case of Gallbladder Cancer Concomitant with Xanthogranulomatous Cholecystitis with Difficulty in Preoperative Diagnosis].

A 78-year-oldman was referredto our hospital for right abdominal pain. The patient was diagnosedwith xanthogranulomatous cholecystitis(XGC)at the gallbladder fundus and adenomyomatosis(ADM)at the gallbladder neck. Because malignancy was undeniable, laparotomy was performed. Frozen section examination of the excised whole-layer gallbladder revealed cancer cells at the gallbladder neck and cystic duct. Therefore, additional gallbladder bed resection, extrahepatic bile duct resection, and lymphadenectomy were performed. The final diagnosis, based on the histopathological examination of all resected specimens, was gallbladder adenocarcinoma(T3aN0M0, Stage ⅢA). ADM was not observedat the same sites as the adenocarcinoma. The fundus lesion was diagnosed as XGC. Here, we report our rare case of XGC coexisting with gallbladder cancer.