Abstract
We report a case of colon cancer which revealed unique acidophilic inclusions in the submucosal layer of colon broadly. The patient was a 70-year-old male. He underwent surgery for transverse colon cancer. The cancer invaded the subserosal layer. There was a large number of acidophilic inclusions in the submucosal layer of the colon broadly. The inclusions were found around the cancer and were invaded by the cancer. The inclusions had clear borders and included fat cells, vessels, nerve plexus, collagen fibers, and elastic fibers. They were periodic acid-Schiff stain negative and did not show positivity for amyloid in the direct fast scarlet stain. In ultrastructual study, the inclusions revealed homogenous dense material accompanied by collagen fibers and elastic fibers. We cannot find any literature about the unique inclusions, and conclude they are unknown material deposits in the colonic wall.
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