[A Case of Resection of Primary Hepatic Neuroendocrine Tumor].

Neuroendocrine tumors(NET)often occur in the digestive tract, pancreas, and lungs. Primary hepatic neuroendocrine tumor(PHNET)is extremely rare and has a high malignancy and poor prognosis. Diagnosis is extremely difficult only by imaging findings, and in majority of the cases, definitive diagnosis is produced by an excisional biopsy. We report a case of PHNET diagnosed by preoperative liver tumor biopsy and underwent surgical resection. A 60's man was admitted with the main complaint of weight loss. Image examination(abdominal echo, CT, MRI)revealed continuous tumors of 6 cm and 5 cm in the liver S4 to S8 area, respectively, and a tumor of <1 cm in the S5 and S7 areas. When liver biopsy was performed, immunostaining revealed that it was chromogranin A-positive. Therefore, it was diagnosed as NET. No other lesions were observed in PET-CT, and the patient was diagnosed with PHNET. Extended left hepatectomy and partial S5/S7 liver resections were performed. The pathological diagnosis was NET and Ki-67 index was 7%, which was equivalent to NET G2 in the WHO classification.