Squamous Cell Carcinoma and Adenoacanthoma of the Colon

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Abstract
Carcinoma of the colon is almost always adenocarcinoma, (Greekadenosgland) which arises from the glandular mucosa lining this viscus. Squamous cell carcinoma or acanthoma (Greekakantha, thorn or prickle) occurs in the anal canal, the lining of which is squamous epithelium, or in the lower part of the rectum adjacent to the anal canal where it may have originated from the nearby squamous or transitional cells. Adenocanthomas are carcinomas in which both glandular and squamous elements are present. Rarely has squamous cell carcinoma been reported to occur in the colon above the peritoneal reflection although it is possible that this tumor may occur more frequently than the number of published case reports would indicate. From 1907, when Herxheimer1presented the case of a patient with adenoacanthoma of the cecum, to 1966, only two squamous cell carcinomas and five additional adenoacanthomas of the colon, excluding the rectum, had been

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