MR Imaging of Focal Medullary Sponge Kidney: Case Report

作者：Hida Tomoyuki; Nishie Akihiro^*; Asayama Yoshiki; Ishigami Kousei; Fujita Nobuhiro; Inokuchi Junichi; Naito Seiji; Ando Sadamu; Honda Hiroshi

来源：Magnetic Resonance in Medical Sciences, 2012, 11(1): 65-69.

DOI：10.2463/mrms.11.65

• CT
• diffusion-weighted imaging
• medullary sponge kidney
• MRI
• MR urography

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%26apos;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 x 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.

• 出版日期2012