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The fine structural morphology of the anal transitional zone is described and is compared to the ultrastructure of urothelium and anal squamous epithelium. Electron microscopic observations in eight cases of cloacogenic carcinoma are also presented. Anal transitional epithelium is not highly specialized and incorporates features of both urothelium and squamous epithelium; slight urothelial differentiation is considered vestigial. Cloacogenic carcinoma is a specific morphologic entity, which can be distinguished from urothelial and squamous carcinoma. The "transitional" variant is composed of cells similar to the intermediate zone cells of anal transitional epithelium, an observation confirming the concept that the transitional form of cloacogenic carcinoma is derived from the anal transitional zone. The "basaloid" and pleomorphic variants appear to represent less differentiated forms of cloacogenic carcinoma.
J J Gillespie, and
B MacKay
June 1960,
American journal of proctology,
J J Gillespie, and
B MacKay
October 1975,
Journal of the American Geriatrics Society,
J J Gillespie, and
B MacKay
September 1981,
Bulletin de l'Association des anatomistes,
J J Gillespie, and
B MacKay
January 1977,
Diseases of the colon and rectum,
J J Gillespie, and
B MacKay
September 1977,
Texas medicine,
J J Gillespie, and
B MacKay
August 1983,
Revista espanola de las enfermedades del aparato digestivo,
J J Gillespie, and
B MacKay
April 1972,
Archives of surgery (Chicago, Ill. : 1960),
J J Gillespie, and
B MacKay
August 1980,
Cancer,
J J Gillespie, and
B MacKay
April 1981,
Archives of surgery (Chicago, Ill. : 1960),
