Uterine Metastasis From Gastric Adenocarcinoma Masquerading as Physiologic Endometrial Uptake in FDG PET/CT.

A 44-year-old woman with newly diagnosed gastric adenocarcinoma by gastroscopy underwent F-FDG PET/CT to evaluate possible metastasis. The images demonstrated intense activity in the region of uterine corpus, as well as greater gastric curvature. Physiologic uptake of endometrium was initially suspected, given the rarity with which extragenital cancers metastasize to the uterus. Ultimately, the endometrium proved to be mucinous adenocarcinoma of gastric origin based on its shared histological features and compatible immunostaining profile.