title: Metastasis from breast carcinoma to a tamoxifen-related endometrial polyp.
abstract: BACKGROUND
  Metastasis of extragenital neoplasms to an endometrial polyp is rare and until now, only 6 cases of such involvement has been described.
  
  
  METHODS
  A 58-year-old woman, who had been diagnosed 4 years ago with infiltrating ductal breast carcinoma and treated with surgery and tamoxifen therapy, was admitted to the gynecology clinic because of endometrial thickening observed during a routine abdominal ultrasonographic examination. A total hysterectomy with bilateral salpingo-oophorectomy was performed. Pathological examination of the specimen showed a large polyp which microscopically showed clusters of cells with signet ring morphology within the polyp stroma. The positivity of tumor cells for GCDFP-15 supported the diagnosis of metastatic breast carcinoma to endometrial polyp.
  
  
  CONCLUSIONS
  Metastatic breast carcinoma should be considered in the differential diagnosis of carcinomas with signet ring cell morphology involving uterus.
authors.affiliation: Osmangazi University Medical Faculty, Department of Pathology, Eskişehir, Turkey. acikalin@ogu.edu.tr
authors.forename: Mustafa Fuat
authors.initials: MF
authors.lastname: Acikalin
authors.forename: Ulkü
authors.initials: U
authors.lastname: Oner
authors.forename: Basar
authors.initials: B
authors.lastname: Tekin
authors.forename: Ekrem
authors.initials: E
authors.lastname: Yavuz
authors.forename: Osman
authors.initials: O
authors.lastname: Cengiz
mesh_terms: D001943:Breast Neoplasms / Q000188:drug therapy / Q000473:pathology* / Q000601:surgery; D018270:Carcinoma, Ductal, Breast / Q000188:drug therapy / Q000556:secondary* / Q000601:surgery; D016889:Endometrial Neoplasms / Q000473:pathology / Q000556:secondary*; D005260:Female; D006801:Humans; D008875:Middle Aged; D011127:Polyps / Q000139:chemically induced / Q000473:pathology*; D013629:Tamoxifen / Q000009:adverse effects* / Q000627:therapeutic use
chemical_list: D013629:Tamoxifen