RESUMO
Renal cell carcinoma (RCC) has high metastatic potential, which requires early diagnosis to optimize the chance of cure. Metastasis of RCC to the head and neck region is less common and metastasis to the buccal mucosa is extremely rare. This phenomenon occurs mostly in patients with generalized dissemination, especially with lung metastases. In this article we report a case of buccal mucosa metastasis from RCC in a 65-year-old man who presented 19 years after undergoing a left radical nephrectomy for clear cell RCC. Surgical excision of the buccal lesion was performed without evidence of recurrence or new metastatic lesions after 6 years of followup. To our knowledge, this is the first case of metastasis to the buccal mucosa from a RCC reported in the literature.
RESUMO
Primary renal malignant fibrous histiocytoma is an extremely rare disease. There are neither clinical nor radiological signs to distinguish it from the most common renal cell carcinoma. Its prognosis is poor because of its tendency to locally recur and metastasize. Therefore, early diagnosis and proper treatment are very important. We present the case of a 66-year-old woman diagnosed with primary renal malignant fibrous histiocytoma who underwent partial nephrectomy. After 41 months' follow-up, there was no evidence of any recurrence. To our knowledge, this is the first reported case of conservative surgery for this kind of tumor.
