title: A healthy young woman with massive hemorrhagic ascites.
abstract: Retrograde menstruation is the backward movement of menstrual fluids. The underlying mechanisms remain unknown. The converse current itself is benign, but the result can be abdominal pain caused by peritoneal irritation and, eventually, endometriosis. The case was of a 25-year-old woman with lower abdominal pain accompanied by significant hemoperitoneum. Physical examination and inspection using abdominal ultrasonography and computed tomography failed to reveal a differential diagnosis. Detailed history taking revealed sexual activities during her menstrual period, which allowed for a diagnosis of retrograde menstruation. These findings emphasize the importance of extensive history taking.
authors.affiliation: Department of Emergency and Critical Care Medicine, JR Tokyo General Hospital, Yoyogi, Shibuya-ku, Tokyo, Japan.
authors.forename: Fumiaki
authors.initials: F
authors.lastname: Kishino
authors.affiliation: Department of Emergency and Critical Care Medicine, JR Tokyo General Hospital, Yoyogi, Shibuya-ku, Tokyo, Japan; Department of Emergency and Critical Care Medicine, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan. Electronic address: inokuchir-icu@h.u-tokyo.ac.jp.
authors.forename: Ryota
authors.initials: R
authors.lastname: Inokuchi
authors.affiliation: Department of Emergency and Critical Care Medicine, JR Tokyo General Hospital, Yoyogi, Shibuya-ku, Tokyo, Japan; Department of Emergency and Critical Care Medicine, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.
authors.forename: Yohei
authors.initials: Y
authors.lastname: Komaru
authors.affiliation: Department of General and Emergency Medicine, JR Tokyo General Hospital, Yoyogi, Shibuya-ku, Tokyo, Japan.
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Takaya
authors.affiliation: Department of Emergency and Critical Care Medicine, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.
authors.forename: Miyuki
authors.initials: M
authors.lastname: Yamamoto
authors.affiliation: Department of Emergency and Critical Care Medicine, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.
authors.forename: Susumu
authors.initials: S
authors.lastname: Nakajima
authors.affiliation: Department of Emergency and Critical Care Medicine, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.
authors.forename: Naoki
authors.initials: N
authors.lastname: Yahagi
mesh_terms: D015746:Abdominal Pain / Q000175:diagnosis* / Q000209:etiology*; D000328:Adult; D003937:Diagnosis, Differential; D005260:Female; D006465:Hemoperitoneum / Q000175:diagnosis* / Q000209:etiology*; D006801:Humans; D008487:Medical History Taking; D008599:Menstruation Disturbances / Q000150:complications* / Q000175:diagnosis*; D014057:Tomography, X-Ray Computed; D014463:Ultrasonography