Primary mesenchymal chondrosarcoma of the kidney is extremely rare, with only nine cases reported in the English literature. We report a new case of this disease. A 35-year-old man, presented with flank pain, episodic gross hematuria and a painless palpable mass in left abdominal quadrant. Computed tomography scan identified a left renal tumor with 20 cm, with no evidence of regional or metastatic spread disease. The patient underwent radical nephrectomy. The immunohistopathological diagnosis was mesenchymal chondrosarcoma of the kidney. At 18 months of follow-up, there was no evidence of recurrence or distant metastasis. Primary renal chondrosarcoma is so rare that its prognosis is unknown. Disease recurrence is unpredictable and when it is detected, the prognosis is poor. The radical nephrectomy with complete resection of the tumor with wide resection free margins is recommended, and the patients need long-term and close surveillance, with particular attention to local recurrence and uncommon sites of metastization.
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