Perianal extramammary Paget's disease and basaloid small-cell carcinoma of the anus are both rare. For the first time a case where both lesions were present is reported. The pathogenesis of extramammary Paget's disease is still a matter of controversy, and there is still disagreement regarding nomenclature of carcinomas arising in the transitional zone of epithelium of the anus. The histopathology of these neoplasms is presented.
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Richard B. Jackson (1975) studied this question.
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