Keratoacanthoma in the differential diagnosis of anal carcinoma: Difficult diagnosis, easy therapy

Abstract

Three male patients who had an anal keratoacanthoma are described. Anal keratoacanthoma is a rapidly growing skin tumor that invades the dermis but remains locally and can mimic clinically and histologically a squamous-cell carcinoma.

Perianal and perineal keratoacanthoma: Two cases demonstrating histologic similarity to subungual keratoacanthoma

“…Herein, we report perianal and perineal keratoacanthomas that exhibit similarity to subungual keratoacanthoma, which has not been noted in prior published reports. Perianal keratoacanthoma is rare, with only 10 cases reported . All except two were reported in the non‐dermatology, non‐dermatopathology literature .…”

“…Perianal keratoacanthoma is rare, with only 10 cases reported . All except two were reported in the non‐dermatology, non‐dermatopathology literature . Two cases were published in the non‐English literature .…”

“…Perianal keratoacanthoma is particularly rare, with only 10 cases reported in the literature to date. No prior cases of perineal keratoacanthoma have been reported. In this report, we describe two cases of keratoacanthoma, one perineal and one perianal, which show histopathologic resemblance to subungual keratoacanthoma.…”

Perianal keratoacanthoma in a 76‐year‐old man

“…It typically appears in sun‐exposed areas. However, perianal KAs are extremely rare and there are only 12 cases reported in literature 1–7 . We present the case of a 76‐year‐old man with a rapidly growing perianal mass.…”

“…KAs in the perianal region are extremely rare with only 12 cases reported in the literature 1–7 . It has occurred more frequently in males (nine males and three females) and in an older population (50–76 years).…”