title: Collision tumor: serous cystadenocarcinoma and dermoid cyst in the same ovary.
abstract: BACKGROUND
  Collision tumor means the coexistence of two adjacent, but histologically distinct tumors without histologic admixture in the same tissue or organ. Collision tumors involving ovaries are extremely rare.
  
  
  METHODS
  We present a case of 45-year-old parous woman with a left dermoid cyst, with unusual imaging findings, massive ascites and peritoneal carcinomatosis. The patient underwent cytoreductive surgery. The histopathology revealed a collision tumor consisting of an invasive serous cystadenocarcinoma and a dermoid cyst.
authors.affiliation: Department of Obstetrics and Gynecology, Faculty of Medicine, Gynecologic Oncology Group, Dokuz Eylul University, Inciralti, Izmir, Turkey. ozgur.bige@deu.edu.tr
authors.forename: Ozgur
authors.initials: O
authors.lastname: Bige
authors.forename: Ahmet
authors.initials: A
authors.lastname: Demir
authors.forename: Meral
authors.initials: M
authors.lastname: Koyuncuoglu
authors.forename: Mustafa
authors.initials: M
authors.lastname: Secil
authors.forename: Cagnur
authors.initials: C
authors.lastname: Ulukus
authors.forename: Ugur
authors.initials: U
authors.lastname: Saygili
mesh_terms: D018284:Cystadenocarcinoma, Serous / Q000473:pathology*; D003884:Dermoid Cyst / Q000473:pathology*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D009378:Neoplasms, Multiple Primary / Q000473:pathology*; D010051:Ovarian Neoplasms / Q000473:pathology*