EVALUATION OF RENAL STONES BY COMPUTED TOMOGRAPHY AND ITS CORRELATION WITH URINE pH AND BIOCHEMICAL ANALYSIS

Description

Introduction: The aim of the study is to assess the composition of renal stones by non chemical analysis that is by use of computed tomography (CT) values in Hounsfield Units (HU) and to compare the results of biochemical stone analysis collected post surgically done in biochemistry lab. Methodology: This is a prospective study, included patients in age group of 25 - 60yrs. Patients who were referred to radiology department from Urology and also patients referred from surgery with complaints of loin pain, groin pain, hematuria, crystalluria were recruited for the study. About 100 patients were screened with first line modality of ultrasound evaluation for identifying the presence of stone in kidney, later on positive confirmation from ultrasound evaluation they were further subjected to CT scan evaluation. Urine was collected from all the patients with renal stones and urine pH was measured. Stones collected post surgically were used for the biochemical analysis to know the chemical composition of the stones RESULTS: The stone removed from the patients of this group contain high calcium content. Most of the stones removed from bladder comprises two categories 1.uric acid (mainly) 2.large stones more than 20 mm size were proved to be calcium stones possibly related to greater sunlight exposure, resulting in increase in insensible fluid losses and increase in vitamin D production. We obtained a reference from hounsfield units value from stones collected post surgically from the urological department. The stones are categorized into three types - Pure highly reflective crystalline white stones, Stones which appears most mostly black, Complex mild yellow stones. Conclusion: CT may enable accurate in vivo characterization of kidney stone composition.