Primary hepatic neuroendocrine tumor——18F-fluorodeoxyglucose positron emission tomography/computed tomography findings: A case report

BACKGROUND Primary hepatic neuroendocrine tumors(PHNETs) are rare hepatic tumors. Their diagnosis, which is based on radiological findings, is difficult.CASE SUMMARY We present a case of PHNET in a 79-year-old man with no clinical symptoms. Computed tomography(CT) and 2-Deoxy-2-[fluorine-18] fluorodeoxyglucose positron emission tomography/CT(18 F-FDG PET/CT) were performed for further evaluation. A hypoattenuating mass with rim-like enhancement in segment 6 of the liver was detected on contrast-enhanced CT imaging. Increased uptake was also observed on 18 F-FDG PET/CT. Histopathological and immunohistochemical examinations, which revealed a grade 2 neuroendocrine tumor(NET), confirmed the diagnosis.CONCLUSION Diagnosing PHNET is challenging, and must be distinguished from other liver tumors. Metastatic NETs should be excluded.