DIAGNOSIS OF COLORECTAL TUMORS BY THE ENDOSCOPIC CONGO RED-METHYLENE BLUE TEST

The endoscopic Congo red-methylene blue tested was performed on 51 tum ors of the large intestine. Results revealed that colorectal adenocarc inomas and adenomas bleached the Congo red and methylene blue sprayed over their surface and so appeared in sharp contrast to the bluish red mucosa of unaffected areas. No bleaching of the dyes was observed on the surface of non-neoplastic polyps. Moderately differentiated adenoc arcinomas, submucosal or advanced cancers, and adenomas with severe at ypia bleached the dyes most frequently. Thus this test facilitates ear ly detection of colorectal tumors.