kidney biopsy -

as I have said on here my ct scan showed i had - Heterogeneous opacification of right renal pelvis on delayed images is concerning for an intra-luminal filling defect. Differential conciderations include transitional cell carcinoma versus hemorrhagic or infectious debris. Correlation with retrograde urography or ureteroscopy is recommended. well my urologist took me to surgery - after he was done he told my husband that my bladder was fine -went to look and take a biopsy of my kidney and low and behold there was nothing in there -no mass nothing - he put a stint in - he did tell my husband that there was a jelly fish like thing floating around the outside of my kidney - how can this be -a miracle or what - I get my stent out next tuesday (which has been very painfull) - but he also wants to do a three phase CT Scan - would anyone know what that is - and why would the first ct scan show that I had a mass and other things wrong? I am so happy about the results but confussed -