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Multicystic dysplastic kidney is the most common form of cystic kidney disease in infants and children. It can arise from failure of the ureteric bud to integrate and branch appropriately into the metanephros during development (1). The involvement is usually unilateral, although bilateral disease can also occur, and in some patients there is segmental involvement of one kidney. Most multicystic dysplastic kidneys are benign and do not require surgical resection (2). Reported complications associated with multicystic dysplastic kidney include pain, infection, hypertension, and neoplasia (3). However, renal cell carcinomas are extremely rare in multicystic dysplastic kidneys. We found only three cases of renal cell carcinoma in previously published reports (4-6). Little is known regarding the imaging characteristics of this condition. We report the sonographic and CT features of a histopathologically proven cystic papillary renal cell carcinoma arising from an involutional multicystic dysplastic kidney. Institutional Review Board approval with waived informed consent (number 2014-02-009) was obtained for this case report.

Cystic Papillary Renal Cell Carcinoma Arising from an Involutional Multicystic Dysplastic Kidney