A CASE OF A GRANULAR CELL TUMOR IN THE CECUM DIAGNOSED FROM ENDOSCOPIC ULTRASONOGRAPHY (EUS) FINDINGS AND AN EXACT BIOPSY

Abstract

A 52-year-old male came to our hospital complaining of lower abdominal pain. A colonoscopy examination revealed a yellowish-white submucosal tumor 4mm in diameter in the cecum. We diagnosed it as a granular cell tumor based on the endoscopic ultrasonography findings and the biopsy findings, and we performed endoscopic mucosal resection of the tumor. The tumor cells were situated from the deeper colonic mucosa to submucosa, and contained abundant cytoplasm with eosinophilic granules on H-E staining. Detailed immunohistochemical staining showed that the cells were positive for S-100 protein and PAS-positive granules in the cytoplasm.