Warthin Tumor Incidentally Detected on PET/CT Showing Both Ga-68-DOTANOC and F-18-FDG Uptake

Abstract

A patient with moderately differentiated pancreatic neuroendocrine tumor with synchronous multifocal liver metastases was referred for further staging with PET/CT. The examinations were performed on 2 consecutive days and showed mild Ga-68-DOTANOC and intense F-18-FDG uptake in an incidental right parotid nodule. Differential diagnoses include primary or metastatic neuroendocrine tumor, malignant or benign primary parotid tumor, and intraparotid lymph node. Histology revealed characteristics of a Warthin tumor. While focal FDG uptake in Warthin tumor is frequently described, the somatostatin expression was rarely reported. This clinical case describes Ga-68-DOTANOC and F-18-FDG uptake in a parotid Warthin tumor histologically confirmed.