IS STONE RADIODENSITY A USEFUL PARAMETER FOR PREDICTING OUTCOME OF EXTRACORPOREAL SHOCKWAVE LITHOTRIPSY FOR LOWER CALYCEAL STONES < 15 MM?

ETAFY, M.1, ABDALMALEK, G.2, SALEH, F.1, GAWISH, M.1
1UCI, Dept. of Urology, Orange, United States of America,
2Alazhar University, Dept. of Urology, Assiut, Egypt.


Introduction & Objectives:
We examined the outcome of SWL for solitary stones less than or equal 15mm located within the Lower calyx, based on their radiographic criteria in KUB.

Material & Methods:
216 patients with solitary lower calyx stones measuring less than or equal 15mm were treated on a Simens lithotriptor. Patients were stratified into 3 groups based on radiographic appearance of the calculus in pre-operative KUB according to homogeneity, smoothness and density. The stone radiodensity was determined relative to the ipsilateral 12th rib. (SFR) were determined at 3 months by (KUB). Patients requiring re-treatment or auxiliary procedures were considered failures in SWL.

Results:
Follow-up information was available in all 216 patients, there was a correlation between stone radiographic criteria and stone composition. The calculi in the SF series were predominantly rough (75%) and had a density less than or equal bone (74%), whereas calculi in the NSF series were most often smooth (56%) and denser than bone (50%).

Conclusions:
Our study suggests that for stones less than or equal 15mm within lower calyx there is tendency for a worse SWL outcome for stones that have a smooth shape or radio-density greater than the 12th rib in KUB than those with rough shape and radio-density less than or equal to the 12th rib in KUB.

 
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