Abstract
A 62-year-old man was referred to our hospital for further investigation of positive results on fecal occult blood screening test. Colonoscopy showed a submucosal tumor (SMT) of 35 mm in diameter in the ascending colon. FDG-PET revealed abnormal uptake in the ascending colon. Boring biopsy under colonoscopy of the SMT did not provide a precise diagnosis. Therefore, we planned endoscopic ultrasound-guided fine-needle aspiration (EUS-FNA) biopsy for the SMT in the ascending colon. After insertion of a colonoscope, insertion of a convex-type EUS was possible using a sliding tube and guidewire. EUS-FNA was performed, and the SMT was diagnosed as a schwannoma. Our result suggests that EUS-FNA at the ascending colon is feasible and effective for obtaining a precise diagnosis.
