[Undifferentiated Carcinoma of the Gallbladder with Rapid Postoperative Progression-A Case Report].

A 74-year-old woman presented with epigastric pain. Imaging revealed a tumor measuring 80 mm, with internal necrosis, originating from the gallbladder and invading the liver. We performed extended anterior segmentectomy of the liver and lymph node resection following a preoperative diagnosis of gallbladder cancer. Histologically, the tumor was diagnosed as an undifferentiated carcinoma of the gallbladder. Although curative resection was performed, the patient developed recurrence with liver metastasis and peritoneal dissemination after 6 postoperative weeks and died after 10 postoperative weeks.