A CASE OF SCHWANNOMA OF THE DESCENDING COLON

Abstract

A 64-year-old female was referred to our institution for evaluation of positive fecal occult blood test. Barium enema and colonoscopy demonstrated an elevated lesion with clear demarcation and rough surface in the descending colon. Histologically, this tumor was made up by spindle cells with enlarged nuclei. The cells were arranged in a random or swirling fashion. In the immunohistochemical study, tumor cells were positive for S-100 protein and NSE stain. These findings suggested that this tumor was a Antoni type A Schwannoma. This was rare tumor of the colon (37 cases published up to 1993 in Japan).