A rare case of perineal endometriosis with anal sphincter involvement

Abstract

Perineal endometriosis is a rare entity which can be explained by direct implantation of endometriotic cells over the fresh episiotomy wound and subsequent development of scar endometriosis. Perineal scar endometriosis incidence is reported to be 0.3% to 1%. 28 years old, P1L1, presented with pain and swelling near episiotomy site which is associated with menstruation. Examination during menstruation revealed swelling was tender, erythematous and slightly increased in size. Clinical diagnosis of scar endometriosis was made after clinical examination. Mass excised and sent for histopathological examination. Although diagnosis essentially remains clinical, preoperative evaluation with perineal ultrasound and MRI was performed. Wide local excision remains treatment of choice and follow up for recurrence is recommended. Histopathological examination is obligatory to exclude rare possibility of malignant changes.