title: [Metachronic thyroid metastasis secondary to renal carcinoma. Case report].
abstract: OBJECTIVE
  We report the case of the patient with metachronic thyroid metastasis of a renal adenocarcinoma.
  
  
  METHODS
  61-year-old patient with the diagnosis of renal adenocarcinoma treated by radical nephrectomy (stage pT3bpN0M0) and subsequent interleukin-2 for twelve months presenting four years after surgery with a thyroid nodule displacing the trachea laterally, requiring left hemithyroidectomy.
  
  
  RESULTS
  Pathology reported a lesion made of clear cytoplasm tumor cells, with marked atypia and anaplastic areas, compatible with clear cell renal adenocarcinoma.
  
  
  CONCLUSIONS
  Thyroid metastases are extremely rare, being renal tumors the most frequent origin. They present as painless nodules, cold in gammagram, with normal thyroid hormones. The treatment of choice is surgical excision, with a better prognosis the longer the time between the primary and the appearance of metastasis.
authors.affiliation: Servicio de Urología, Hospital de Cruces, Baracaldo, España. jolaverri@hotmail.com
authors.forename: Jorge
authors.initials: J
authors.lastname: García-Olaverri Rodríguez
authors.forename: Ainara
authors.initials: A
authors.lastname: Villafruela Mateo
authors.forename: Igor
authors.initials: I
authors.lastname: Azurmendi Arin
authors.forename: Iban
authors.initials: I
authors.lastname: Olano Grasa
authors.forename: Roberto
authors.initials: R
authors.lastname: Llarena Ibarguren
authors.forename: Carlos
authors.initials: C
authors.lastname: Pertusa Peña
mesh_terms: D000230:Adenocarcinoma / Q000556:secondary*; D005260:Female; D006801:Humans; D007680:Kidney Neoplasms / Q000473:pathology*; D008875:Middle Aged; D013964:Thyroid Neoplasms / Q000556:secondary*