title: FNA diagnosis of retroperitoneal leiomyosarcoma metastasizing to the breast.
abstract: Fine-needle aspiration (FNA) biopsy is one of the first-line investigations in any breast lump, and hence cytomorphological recognition of nonmammary metastatic tumors to the breast and their distinction from primary tumors is important. Breast metastasis from extra-mammary malignancy is rare, constituting 2% of breast tumors; even rarer are metastatic leiomyosarcomas. Our patient presented with a breast lump 2 years after operative removal of a retroperitoneal leiomyosarcoma. The breast lump was confirmed to be a metastasis from the earlier primary. Herein, we report the first case of a retroperitoneal leiomyosarcoma metastatic to the breast diagnosed by Fine Needle Aspiration.
authors.affiliation: Department of Pathology, Loyola University Medical Center, Maywood, Illinois, USA.
authors.forename: Gulbeyaz
authors.initials: G
authors.lastname: Omeroglu
authors.forename: Cağatay
authors.initials: C
authors.lastname: Ersşahin
authors.forename: Ronald K
authors.initials: RK
authors.lastname: Potkul
authors.forename: Christine N
authors.initials: CN
authors.lastname: Booth
mesh_terms: D044963:Biopsy, Fine-Needle; D001943:Breast Neoplasms / Q000556:secondary*; D005260:Female; D005348:Fibrocystic Breast Disease / Q000473:pathology; D006801:Humans; D007150:Immunohistochemistry; D007890:Leiomyosarcoma / Q000556:secondary*; D008875:Middle Aged; D012186:Retroperitoneal Neoplasms / Q000473:pathology*