title: Symptomatic cesarean scar diverticulum: a case report.
abstract: BACKGROUND
  Extrauterine lesions of intermediate trophoblast have occurred in and around fallopian tubes and ovaries and are thought to result from an exaggerated trophoblastic response to the implantation site of a previous ectopic pregnancy. Additionally, cesarean scar defects have recently been identified as a source of persistent, irregular vaginal bleeding in women and can be identified by pelvic ultrasound.
  
  
  METHODS
  A 35-year-old woman presented with irregular vaginal bleeding in association with an anterior extrauterine cystic mass detected by pelvic ultrasound and thought to represent a cesarean scar defect. Subsequent histology revealed an endometrial diverticulum lined with chorionic-type intermediate trophoblast, a subpopulation of trophoblast that composes placental site nodules.
  
  
  CONCLUSIONS
  This was the first case of a lesion of intermediate trophoblast occurring in a cesarean scar diverticulum.
authors.affiliation: Department of Obstetrics and Gynecology, 1st Fighter Wing Hospital/SGOBO, 45 Pine Street, Langley Air Force Base, VA 23665-2025, USA. robert.fischer@langley.af.mil
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Fischer
mesh_terms: D000328:Adult; D002585:Cesarean Section / Q000009:adverse effects*; D002921:Cicatrix / Q000473:pathology*; D004240:Diverticulum / Q000209:etiology* / Q000473:pathology; D004717:Endometrium / Q000473:pathology*; D005260:Female; D006801:Humans; D011247:Pregnancy; D014327:Trophoblasts / Q000473:pathology*