Pelvic lipomatosis: diagnosis and characterization by magnetic resonance imaging.

While the number of reported cases of pelvic lipomatosis has been relatively small, this entity’s prevalence is probably underestimated. Disease progression can cause hydroureteronephrosis and renal failure, and clinical follow-up is mandated after diagnosis. Diagnosis is based on detection of characteristic findings in conventional radiographs and computed tomographic (CT) images. We report here the magnetic resonance imaging (MRI) features of pelvic lipomatosis in 5 male patients, 2 of whom ultimately required placement of a ureteral stent to alleviate mechanical obstruction.