<prompt> Investigation of choice in ureteric colic is -Noncontrast CT scanUSGX ray KUBContrast enhanced CT scan  <response>: Ans. is a i.e., Noncontrast CT scan o Investigation of choice for renal and ureteric stones - non - contrast spiral CTo Most commonly used investigation to diagnose urinary tract obstruction - USGo Most commonly used initial investigation of urinary tract malignancies kidney, bladder - USGo Investigation of choice for diagnosis and staging of RCC - contrast - enhanced CTo Investigation of choice to detect IVC and renal vein involvement in RCC - MRI lst choice, Doppler USG 2nd choice.o Investigation of choice for hydronephrosis - USGo Investigation of choice for vesicourethral reflex - voiding micturating cystourethrogram.o Investigation of choice for posterior urethral valve - voiding micturating cystourethrogram.o Best method to visualize posterior urethra - voiding cystourethrogram.o Investigation of choice for pyonephrosis - USG 