Perianal endometriosis: A rare case report

Endometriosis is defined as the presence of endometrial tissue outside the endometrium and myometrium. Endometriosis is a relatively less common disease. Perianal endometriosis is a very rare entity. The lesion is usually localised in the episiotomy scars and uncommonly associated with cyclical pain. Here a case of perianal endometriosis in a 30 year old female patient having painful perianal swelling, who had a history of episiotomy is being reported. Clinically diagnosed as perianal abscess, the lesion was treated surgically by wide margin excision. Histopathological examination revealed presence of endometriotic tissue, composing of endometrial glands surrounded by endometrial stromal cells. Presence of endometrial stromal cells is confirmed by CD10 marker during IHC. Thus the histomorphological and IHC findings were consistent with the diagnosis of perianal endometriosis.