CT Scan Parameters as Predictor of Ureteric Stoneimpaction and Ureteric Injury Post Laser Lithotripsy

Abstract

Introduction: Renal stone are little, firm deposit inside kidney, the stone consist from acid salts and minerals
so the stone form in the urinary system it considered the most common reasons of sudden renal colic,
Ureterorenoscopic lithotripsy (URS) for removal of stone is considered optimum procedure for patients
suffer from renal stones.
Aims: To Study the relation of CT parameters in stone patients and determine which parameters are the
valuable in prediction of the Surgical outcome).
Patient and Method: A prospective study conducted of 20 patients with ureteric stones, followed up
in urology consultation unit, Data collected from theater room determined by surgeon were: Stone
impaction,iatrogenic injury,DJ use. Data collected from CT imaging were Stone number and side, Stone
site, Stone diameter,Tissue rim sign,Degree of hydronephrosis and Stone hounsfield unit.
Results: The collected data showed male (60%) predominance over females (40%) The commonest age
group was 30-39 years (30%) The results showed that (70%)of stones lies in one ureter but without any
correlation with surgical outcome. Regarding Stone Diameter our study showed (20%)of patients with
stones >10 mm in axial image all had impacted stones. Regarding Tissue Rim sign >2.5 mm at level of stone
site correlate with impaction and injury. Moderate/sever degree of hydronphrosis correlate with impaction
and injury.
Conclusions: CT parameters that had strong relation to the surgical outcome in regard of stone impaction
and intraoperative iatrogenic injury.