title: Metaplastic Breast Carcinoma with Unusual Presentation: Review of Three Cases.
abstract: BACKGROUND
  Metaplastic breast carcinoma is an uncommon type of breast cancer that usually appears as a large, fast growing breast lump.
  
  
  METHODS
  We report 3 cases of metaplastic breast carcinoma presented at our clinic in 2014. The mean age at diagnosis was 67.3 years. 1 patient presented with a fast growing, large mass detected by herself. However, in the other 2 patients, the nodule was approximately 1.5 cm in size, not fast growing, and was detected on mammography. All 3 patients were treated surgically (2 lumpectomies and 1 mastectomy), with the final pathology of metaplastic carcinoma with chondroid mesenchymal differentiation in 2 cases and metaplastic carcinoma with myoepithelial differentiation in the 3rd case. The patients are still under adjuvant therapy.
  
  
  CONCLUSIONS
  Metaplastic breast carcinoma may present unusually as a non-palpable lump. This entity must be considered in any breast lump.
authors.affiliation: Department of Obstetrics and Gynecology, University Hospital Burgos, Spain.
authors.forename: M Asunción
authors.initials: MA
authors.lastname: Fernández Pérez
authors.affiliation: Department of Pathology, University Hospital Burgos, Spain.
authors.forename: Isabel
authors.initials: I
authors.lastname: Viqueira Rodriguez
authors.affiliation: Department of Obstetrics and Gynecology, University Hospital Burgos, Spain.
authors.forename: Alberto
authors.initials: A
authors.lastname: Tello Royloa
authors.affiliation: Department of Obstetrics and Gynecology, University Hospital Burgos, Spain.
authors.forename: Javier
authors.initials: J
authors.lastname: Martínez Guisasola
keywords: Breast cancer; Clinical presentation; Metaplastic carcinoma