title: Metastasis of Renal Clear Cell Carcinoma to Thyroid Gland Mimicking Adenomatous Goiter.
abstract: BACKGROUND
  Renal cell carcinoma is an interesting tumor due to its unpredictable behavior. Common metastatic sites of renal cell carcinoma are the lungs, lymph nodes, bones and liver. Concurrent thyroid metastasis of clear cell carcinoma is uncommon but it can appear as a rapidly growing cervical, painless nodular mass.
  
  
  METHODS
  We report a case of a 56-year-old male patient with clear cell renal carcinoma confirmed on a histopathological examination. The patient noticed a rapidly growing mass in the thyroid region when receiving medical anticancer therapy. Because of that, gray-scale thyroid ultrasonography and a fine-needle aspiration biopsy were performed. The histopathological examinationof the biopsy specimen revealed a lesion composed of malignant epithelial cells compatible with metastasis of renal carcinoma.
  
  
  CONCLUSIONS
  In patients with with a history of RCC, both past and present, a thyroid mass, especially co-existing with an adenomatous goiter, should prompt a work-up for thyroid metastasis.
authors.affiliation: Department of Radiology, Ataturk Training and Research Hospital, Izmir Katip Celebi University, Izmir, Turkey.
authors.forename: Atilla Hikmet
authors.initials: AH
authors.lastname: Cilengir
authors.affiliation: Department of Radiology, Ataturk Training and Research Hospital, Izmir Katip Celebi University, Izmir, Turkey.
authors.forename: Tugce Ozlem
authors.initials: TO
authors.lastname: Kalayci
authors.affiliation: Department of Radiology, Ataturk Training and Research Hospital, Izmir Katip Celebi University, Izmir, Turkey.
authors.forename: Gokhan
authors.initials: G
authors.lastname: Duygulu
authors.affiliation: Department of Pathology, Ataturk Training and Research Hospital, Izmir Katip Celebi University, Izmir, Turkey.
authors.forename: Turkan Atasever
authors.initials: TA
authors.lastname: Rezanko
authors.affiliation: Department of Radiology, Ataturk Training and Research Hospital, Izmir Katip Celebi University, Izmir, Turkey.
authors.forename: Mehmet Fatih
authors.initials: MF
authors.lastname: İnci
keywords: Carcinoma, Renal Cell; Goiter; Neoplasm Metastasis; Thyroid Nodule