title: A rare case of true carcinosarcoma of the breast.
abstract: BACKGROUND
  True carcinosarcoma of the breast is an extremely rare condition, accounting for 0.08-0.2% of all breast malignancies. The correct definition of this tumor requires both a carcinomatous component and a malignant non-epithelial component of mesenchymal origin, without evidence of a transition zone between the two elements.
  
  
  METHODS
  We present a case of a 49-year-old woman presenting with a 4cm mass at the level of her left breast upper-outer quadrant with a histologic diagnosis of true carcinosarcoma of the breast.
  
  
  CONCLUSIONS
  The most appropriate therapeutic regimens for breast carcinosarcoma are still unclear because of the rarity of this condition, but Breast Conserving Treatment (BCT) followed by adjuvant chemotherapy seems to provide a prognosis equalling that of usual Invasive Ductal Carcinoma of the breast.
authors.affiliation: Department of Gastroenterology, Endocrinology and Surgery, Breast Unit, AOU "Federico II", Via S.Pansini 5, 80131 Naples, Italy.
authors.forename: Antonello
authors.initials: A
authors.lastname: Accurso
authors.affiliation: Department of Biomorphological and Functional Sciences, Section of Pathologic Anatomy, Faculty of Medicine and Surgery, University of Naples "Federico II", Via S. Pansini 5, 80131 Naples, Italy.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Ciancia
authors.affiliation: Department of Clinical Medicine and Surgery, Faculty of Medicine and Surgery, University of Naples "Federico II", Via S. Pansini 5, 80131 Naples, Italy.
authors.forename: Gianni Antonio
authors.initials: GA
authors.lastname: Della Corte
authors.affiliation: Department of Clinical Medicine and Surgery, Faculty of Medicine and Surgery, University of Naples "Federico II", Via S. Pansini 5, 80131 Naples, Italy.
authors.forename: Paola
authors.initials: P
authors.lastname: Reale
authors.affiliation: Department of Clinical Medicine and Surgery, Faculty of Medicine and Surgery, University of Naples "Federico II", Via S. Pansini 5, 80131 Naples, Italy.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Accardo
authors.affiliation: Department of Clinical Medicine and Surgery, Faculty of Medicine and Surgery, University of Naples "Federico II", Via S. Pansini 5, 80131 Naples, Italy.
authors.forename: Carmela
authors.initials: C
authors.lastname: Salerno
authors.affiliation: Department of Senology, Asur Marche Area Vasta 1, Santa Maria della Misericordia, Via Comandino 70, Urbino, Italy.
authors.forename: Daniele
authors.initials: D
authors.lastname: Bordoni
authors.affiliation: Breast Surgery Unit, IRCCS-Arcispedale Santa Maria Nuova, Viale Risorgimento 80, 42123 Reggio Emilia, Italy.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Falco
authors.affiliation: Department of Clinical Medicine and Surgery, Faculty of Medicine and Surgery, University of Naples "Federico II", Via S. Pansini 5, 80131 Naples, Italy. Electronic address: nicolarocco2003@gmail.com.
authors.forename: Nicola
authors.initials: N
authors.lastname: Rocco
keywords: Biphasic metaplastic sarcomatoid carcinoma; Carcinosarcoma; Rare breast tumours