UroToday.com - Oncocytoma is a benign tumor originating from the distal tubule. Despite the benign nature of this tumor, it is resected in the vast majority of cases. The issue of pre-nephrectomy renal biopsy as a way to differentiate between benign and malignant renal tumors was addressed in the past and did not become common practice. The reason for this is threefold. First, the natural history of this tumor is not well defined and thus the implications of leaving an oncocytoma behind are not known...
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