Fig. 2
From: Clinical presentation of perineal endometriosis and prognostic nomogram after surgical resection
Histopathological presentations of perineal endometriosis (PEM) A: palpable nodules located in episiotomy scar of perineum; B: the gross specimen of PEM after surgical excision, components of old hemorrhage was observed; C and D: microscopic appearance of PEM with anal sphincter involvement, showing an endometrial gland appeared in the sphincteric muscular tissue (H&E stain, × 100)