We retrospectively reviewed MR studies on 10 patients with renal-related perinephric fluid collections who underwent MRI in three institutions between January 2001 and August 2004. All patients underwent MRI of the abdomen and T1-weighted T2-weighted and serial contrast-enhanced images including delayed-phase contrast-enhanced images 10-12 min after contrast injection were obtained. Perinephric fluid collections in 5 patients revealed MRI findings of simple fluid content (i.e. hypointense on ...