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Colonic muco-submucosal elongated polyp: diagnosis with endoscopic ultrasound

Departments of ¹ Gastroenterology and ² Pathology, Aso Iizuka Hospital, 3-83 Yoshio, Iizuka 820-8505, Japan

View larger version (124K): [in a new window]   Figure 1. Patient 7. Colonoscopy of the ascending colon shows a pedunculated polypoid lesion. The surface is smooth and covered with normal colonic mucosa.

View larger version (117K): [in a new window]   Figure 2. Patient 7. Endoscopic ultrasound shows an elongated polypoid lesion consisting of intact first to third layers, revealing mucosal and submucosal colonic layers. There is no echogenic mass or muscularis propria (arrow-mp) layer in the polyp.

View larger version (142K): [in a new window]   Figure 3. Patient 7. Endoscopic ultrasound of the head portion of the polyp demonstrates multiple microcystic components (arrows) in the submucosal layer.

View larger version (102K): [in a new window]   Figure 4. Patient 7. Histology showing the cross-section of a polyp consisting of mild, chronically inflamed mucosa and submucosa, with oedematous, loose, fibrous connective tissue.

View larger version (175K): [in a new window]   Figure 5. Patient 7. Microscopic findings of a polyp showing the submucosal oedema, with dilated vessels and lymphatics.