title: [Clear cell renal cell carcinoma metastasized by a breast ductal carcinoma].
abstract: OBJECTIVE
  To report a clear cell renal cell carcinoma recipient of a metastasizing ductal carcinoma of the breast: A tumor-to-tumor metastasis.
  
  
  METHODS
  A 71 year-old woman with a past history of breast carcinoma, diagnosed 12 years before, underwent a nephrectomy for an incidental kidney mass found in a routine imaging examination.
  
  
  RESULTS
  Histological examination revealed foci of ductal carcinoma of the breast in an otherwise typical clear cell renal cell carcinoma of the kidney. Immunohistochemical examination confirmed a metastasis of an infiltrating breast carcinoma to a clear cell renal cell carcinoma (positive to GATA3, hormonal receptors and mamoglobin) in a clear cell renal cell carcinoma (positive to PAX8, CD10 and vimentin).
  
  
  CONCLUSIONS
  Awareness of this phenomenon should always be kept in mind by urologist in patients with a known history of a previous malignancy and by pathologists when finding a renal tumor with an unusual or dimorphic morphology. Immunohistochemistry plays an important role to establish the exact diagnosis.
authors.affiliation: Anatomic Pathology. Hospital S. Juan de la Cruz. Úbeda.
authors.forename: M
authors.initials: M
authors.lastname: Urdiales-Viedma
authors.affiliation: Anatomic Pathology. Complejo Hospitalario de Jaén.
authors.forename: Rafael J
authors.initials: RJ
authors.lastname: Luque
authors.affiliation: Urology. Hospital San Juan de la Cruz. Úbeda. Spain.
authors.forename: F
authors.initials: F
authors.lastname: Valle
authors.affiliation: Anatomic Pathology. Hospital S. Juan de la Cruz. Úbeda.
authors.forename: S
authors.initials: S
authors.lastname: Martos-Padilla
mesh_terms: D000368:Aged; D001943:Breast Neoplasms / Q000473:pathology*; D044584:Carcinoma, Ductal / Q000556:secondary*; D002292:Carcinoma, Renal Cell / Q000473:pathology*; D005260:Female; D006801:Humans; D007680:Kidney Neoplasms / Q000556:secondary*