Rare RCCs include collecting duct RCC, multilocular cystic RCC, neuroblastoma-associated RCC, medullary carcinoma, and mucinous tubular and spindle cell carcinoma (MTSCC). Collecting duct RCC accounts for approximately 1% of all cases and is aggressive. Multilocular cystic RCC has a better prognosis. MTSCC can have a favorable outcome when diagnosed early.

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