대한대장항문학회

Carcinoid is a tumor that primarily affects the intestinal tract, which arise from the<br>Kultchitsky cells found at the base of the crypts of Lieberkuhn. These cells are found<br>to increase in the distal small bowel, are common in the appendix, and then decrease<br>within the mucosa of the colon from cecum to rectum. Carcinoid tumors have also been<br>called argentaffinomas because of their silver staining qualities, which is associated with<br>argentaffinity; this in turn, is related to the carcinoid syndrome by the elaboration of<br>active polypeptides. Carcinoid tumors of the hindgut are argentaffin-negative<br>and<br>argyrophil-positive and rarely present carcinoid syndrome. In the cumulated world<br>literature, the incidence of carcinoids of the rectum is slightly higher than 10 percent.<br>All of these tumors are within reach of the rigid proctosigmoidoscope, most being<br>located between 5 and 15 cm from the anal verge. Eighty five percent are found on the<br>anterior or lateral walls. The tumors are usually submucosal and yellowish or lighttan in<br>color. The vast majority of rectal carcinoid tumors are benign, which can be treated by<br>local excision safely. Lesions larder than 2 cm and invading the muscular wall of the<br>rectum should be considered malignant, which treated by more radical surgery such as<br>abdominoperineal resection. We have experienced a case of carcinoid tumor of the<br>rectum, which was excised locally with electrofulguration through anus successfully.<br>