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Background; Magnetic resonance urography (MRU) is a new technique using heavily weighted T2 images. The present study described the clinical usefulness of MRU.Patients and Methods; Twenty-seven patients with urinary tract obstruction and 2 patients without obstruction underwent MRU. The urogram was reconstracted by means of maximum intensity projection method and multiplanar reformation method. As imaging examinations, intravenous urography (IVU) and retrograde pyelography (RP) were conducted in 22 and 11 patients, respectively. The quality of the images was subjectively classified into4grades (grade 0 to 3).Results; In the comparison of IVU to MRU, 9 patients whose urinary tracts were not identifiable or slightly identifiable (grade 0 or 1) by IVU showed grade 2.5 in the average in MRU. The average grade obtained by MRU was 2.6 in the patients whose urinary tracts were not clearly shown by RP.Conclusions; MRU provides an alternative to conventional imagings of urinary tract, especially in the cases in which only poor images are obtained by IVU. Although MRU cannot completely replace RP, it is useful to identify the location of the urinary tract disease, which is unidentifiable by RP., 背景；Magnetic resonance urography（MRU）はT２強調MRUとも呼ばれる新しい画像診断技術であり，当科における本法の臨床的有用性について検討した。対象と方法；尿路閉塞を伴う２７症例，および尿路閉塞を伴わない２症例を対象とした。尿路はmaximum intensity projection法とmultiplanar reformation法で描出した。他の画像診断として静脈性尿路造影（intravenous urography : IVU）および逆行性腎盂造影（retrograde pyelography : RP）を各々２２例，１１例に施行した。得られた画像はgrade０から３の４段階評価を加えた。結果；IVUとMRUの比較では，IVUで尿路の描出がgrade０あるいは１の９症例において，MRUでは尿路描出能は平均grade２．５であった。またRPで尿路描出が不良であった症例のMRU尿路描出能は平均grade２．６であった。結論；MRUは特にIVUで尿路の描出が不良な症例において優れた尿路描出能が認められた。MRUは完全にRPの診断能を凌駕するものではないが，RPで診断できないような尿路閉塞病変の位置確認などに有用であった。