title: [A woman with periodical bleeding from her umbilicus].
abstract: A 33-year-old woman complained of a tumor in her umbilicus with bleeding during her menstrual periods. The diagnosis was made after surgical excision of the tumour: endometriosis of the umbilicus, also known as 'Villar's node'.
authors.affiliation: Groene Hart Ziekenhuis, afd. Gynaecologie en verloskunde, Gouda.
authors.forename: Sadé N S
authors.initials: SN
authors.lastname: Daal
authors.forename: Freek E
authors.initials: FE
authors.lastname: van Slooten
authors.forename: J C M Hans
authors.initials: JC
authors.lastname: van Huisseling
mesh_terms: D000328:Adult; D004715:Endometriosis / Q000175:diagnosis* / Q000601:surgery; D005260:Female; D006470:Hemorrhage / Q000175:diagnosis / Q000601:surgery; D006801:Humans; D008598:Menstruation; D014472:Umbilicus / Q000473:pathology* / Q000601:surgery