Clinical Endoscopy  2014;47(5):460-463

doi:10.5946/ce.2014.47.5.460

Endoscopic Ultrasound-Guided Sampling of a Metastatic Mucinous Adenocarcinoma Mimicking a Gastric Subepithelial Tumor.

Dae Chul SEO 1 ; Tae Hee LEE ; Yoon Mi JEEN ; Hyun Gun KIM ; Eui Bae KIM ; Sang Cheol LEE

Affiliations

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Keywords

Appendix; Endosonography; Biopsy, fine-needle; Adenocarcinoma, mucinous; Stomach

Country

Republic of Korea

Language

English

Abstract

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.