Successful Resection of Solitary Abdominal Wall Metastasis of Sarcomatous Intrahepatic Cholangiocarcinoma

Sarcomatous intrahepatic cholangiocarcinoma (ICC) is a rare histological variant of ICC that is composed of both adenocarcinoma (ICC component) and sarcomatous components. Surgery is believed to be the primary treatment, and some reports describe primary resection. However, due to the aggressive malignancy of sarcomatous ICC, there is no report regarding resection of a metastatic lesion. In this report, we present the case of a 75-year-old woman admitted to our hospital with the chief complaint of weight loss. Various imaging techniques demonstrated a single mass in the liver and cecum. A cecal gastrointestinal stromal tumor accompanied by liver metastasis was suspected, and ileocecal resection was performed for diagnostic purposes. However, the tumor was present in the abdominal wall rather than in the cecum. The tumor was resected and diagnosed as undifferentiated sarcoma. We suspected the liver tumor was a series of lesions, so we performed hepatectomy. As the tumor was composed of both adenocarcinoma and sarcomatous components, it was diagnosed as sarcomatous ICC. The histological findings of the abdominal wall tumor were similar to those of sarcomatous ICC, so we diagnosed the abdominal wall tumor as a solitary metastasis of sarcomatous ICC. In this case, solitary metastasis was observed, and we were able to resect both the primary and metastatic lesions. This case illustrates that when solitary metastasis can be seen in sarcomatous ICC, radical resection is possible.