Metastatic mucinous adenocarcinoma of appendix origin and mimicking a gastric subepithelial tumor (SET) is very rare. Endoscopic ultrasound (EUS)-guided sampling is a useful diagnostic method for SETs. However, the cytologic findings of metastatic mucinous adenocarcinoma are unfamiliar to many pathologists and gastroenterologists. These findings present a diagnostic challenge because the introduction of gastric epithelium and mucin into the specimen during the procedure can be misleading. This is the first reported experience of an EUS-guided sampling of a gastric SET in a patient with suspected appendiceal tumor, to make the diagnosis of a mucinous adenocarcinoma.

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• A Case of Transduodenal Endoscopic Ultrasound-Guided Biopsy of an Appendiceal Lesion
  Nihal Ijaz Khan, Abdullah Abbasi, Saurabh Chandan, Sagar Pathak, Charanjeet Singh, Muhammad K. Hasan
  ACG Case Reports Journal.2024; 11(12): e01574.     CrossRef