MR imaging of focal medullary sponge kidney: Case report

Tomoyuki Hida, Akihiro Nishie, Yoshiki Asayama, Kousei Ishigami, Nobuhiro Fujita, Junichi Inokuchi, Seiji Naito, Sadamu Ando, Hiroshi Honda

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


We present a case of focal medullary sponge kidney (MSK) that mimicked a renal tumor. Evaluation of a patient with history of macrohematuria revealed a left renal mass of 3-cm diameter. T 1-weighted magnetic resonance (MR) images revealed a mass of mixed intensity protruding toward the renal sinus. On fat-saturated T 2-weighted MR images, the lesion's remarkable hyperintensity suggested the presence of an aggregation of tiny cysts. On diffusion-weighted MR images, the mass also demonstrated high intensity, and its apparent diffusion coefficient was partly decreased (1.12×10 -3 mm 2/s). On computed tomography, precontrast images revealed no calcification in the mass. Although slight enhancement was seen in the corticomedullary phase, thick and dense streaks of contrast radiating peripherally were identified in the mass in the excretory phase. Focal MSK was diagnosed. We discuss the potential of MR imaging for diagnosing focal MSK.

Original languageEnglish
Pages (from-to)65-69
Number of pages5
JournalMagnetic Resonance in Medical Sciences
Issue number1
Publication statusPublished - 2012

All Science Journal Classification (ASJC) codes

  • Radiology Nuclear Medicine and imaging


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