title: Perianal endometriosis with involvement of the external anal sphincter.
authors.affiliation: Department of Surgery, Karl-Franzens University Graz, Austria.
authors.forename: W
authors.initials: W
authors.lastname: Schweiger
authors.forename: H
authors.initials: H
authors.lastname: Bacher
authors.forename: H
authors.initials: H
authors.lastname: Cerwenka
authors.forename: H J
authors.initials: HJ
authors.lastname: Mischinger
mesh_terms: D000328:Adult; D001003:Anal Canal / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D001004:Anus Diseases / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D004715:Endometriosis / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D005260:Female; D006801:Humans; D014463:Ultrasonography