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Unilateral medullary sponge kidney detected on bone scan.

After resection of a medulloblastoma, a 2-year-old boy had a bone scan to rule out metastasis. An abnormally intense concentration of Tc-99 m MDP was noted within the left kidney. A renal scan performed on the previous day showed no obstruction. Further renal evaluation with sonography revealed calcifications of the left medullary pyramid tips and renal sinus. The right kidney was normal. The findings are consistent with the clinical diagnosis of a unilateral medullary sponge kidney