الفهرس 
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Abstract
Urolithiasis is prevalent worldwide and is considered the third commonest urological problem. The advent of ESWL as noninvasive technique revolutionized therapy for urinary tract stones and it is regarded effective and safe in 98% patients.
NCCT for detecting attenuation values of urinary tract stones and skin to stone distance prior to extra-corporeal shock wave lithotripsy can help to propose treatment options and to plan alternative management in patients with likelihood poor outcome from ESWL.
The aim of this study is to know the effect of Hounsfield unit of renal stones and skin to stone distance detected by NCCT on the outcome of extracorporeal shock wave lithotripsy.
We recruited sixty patients in urology department, Faculty of Medicine, Menoufia University hospital. All patients were presented by renal stones treated by ESWL using electromagnetic Dornier lithotripter in the period between December 2017 and December 2019. Patients were divided into 4 groups according to HU of renal stones and SSD:
1- (< 1000 HU) with SSD < 10 cm.
2- (< 1000 HU) with SSD > 10 cm.
3- (> 1000 HU) with SSD < 10 cm.
4- (> 1000 HU) with SSD > 10 cm.
All patients were evaluated 2 weeks after each ESWL session with plain KUB and NCCT to assess stone fragmentation.
regarding the stone free rate, groups (1), and (3) showed 100% stone free rate which were non-significant to each other, and non-significant to the stone free rate in group (2) (86%). On the other hand, in group (4) the stone free rate was 80% which was significantly lower (P > 0.05) than that in group 1 and 3 but non-significant to group (2). Stone density and SSD were found to be significantly correlated to number of SWL sessions.