Effectiveness of MR Urography in the Evaluation of Kidney which Failed to Opacify during Excretory Urography: Comparison with Ultrasonography.
- Author:
Sung Il HWANG
1
;
Seung Hyup KIM
;
Young Jun KIM
;
Ah Young KIM
;
Jung Yun CHO
;
Joon Woo LEE
;
Hyung Seok KIM
;
Kyung Mo YEON
Author Information
- Publication Type:Original Article ; Comparative Study
- Keywords: Kidney, obstruction; Kidney, MR; Kidney, US; Urography,Magnetic resonance (MR),comparative studies
- MeSH: Comparative Study; Female; Human; Kidney/*pathology/radiography/ultrasonography; *Magnetic Resonance Imaging; Male; Middle Age; Prospective Studies; Time Factors; Urinary Tract/*pathology/ultrasonography; Urography; Urologic Diseases/*diagnosis
- From:Korean Journal of Radiology 2000;1(3):152-158
- CountryRepublic of Korea
- Language:English
- Abstract: OBJECTIVE: The purpose of this study was to compare the effectiveness of MR urography (MRU) with that of ultrasonography (US) in the evaluation of urinary tract when this failed to opacify during excretory urography (EXU). MATERIALS AND METHODS: Twelve urinary tracts in 11 patients were studied. In each case, during EXU, the urinary system failed to opacify within one hour of the injection of contrast media, and US revealed dilatation of the pelvocalyceal syytem. Patients underwent MRU, using a HASTE sequence with the breath-hold technique; multi-slice acquisition was then performed, and the images were reconstructed using maximal intensity projection. Each set of images was evaluated by three radiologists to determine the presence, level, and cause of urinary tract obstruction. RESULTS: Obstruction was present in all twelve cases, and in all of these, MRU accurately demonstrated its level. In this respect, however, US was successful in only ten. The cause of obstruction was determined by MRU in eight cases, but by US in only six. In all of these six, MRU also successfully demonstrated the cause. CONCLUSION: MRU is an effective modality for evaluation of the urinary tract when this fails to opacify during EXU, and appears to be superior to US in demon-strating the level and cause of obstruction.
