Abstract
We report a case of retroperitoneal neurilemmoma arisen from the common hepatic plexus, together with some bibliographical comments.
A 63-year-old woman, who had been treated in our hospital because of pneumonia, was found to have a tumor of 4.0 cm in diameter in the hepatic hilum by a CT scan. Abdominal US showed this tumor as a hypoechoic mass with a cystic portion. The tumor was hardly enhanced, but in the late phase, the septum in the tumor was slightly enhanced in an abdominal CT scan. The tumor produced a hypointense signal on T1-weighted MRI images, and a hyperintense signal on T2-weighted images. We conducted operation under a preoperative diagnosis of neurilemmoma or lymphangioma arisen in the hepatoduodenal ligament. We found the tumor, which had a smooth surface and a surrounding capsule, in the hepatic hilum. The tumor was firmly adherent to the common hepatic plexus, so we had great difficulties in removing it. The intraoperative frozen section diagnosis of the tumor was neurilemmoma, and it was considered to have arisen from the common hepatic plexus. The pathological diagnosis was benign neurilemmoma, having mixed formation of Antoni type A and B. She has been free from recurrence 3 years after the operation.
