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CT Renal Stone

Technique: Helical CT scan of the abdomen and pelvis without the use of contrast, with the patient prone. Multiplanar reformations were performed. Findings: There is a 4 mm obstructing ureterolith demonstrated within the distal third of the right ureter. There is associated moderate hydroureteronephrosis demonstrated, which appears unchanged from the comparison examination. The size and morphology of this visualized ureterolith suggests that this is the same stone from the comparison study, though it has migrated inferiorly. No obstructing ureterolithiasis or hydronephrosis is demonstrated on the left. There is no ureteral stone or hydronephrosis. A 2 mm calcification is seen in the interpolar region of the right kidney. A 2.7 x 2.7 cm water density mass in the upper pole of the right kidney suggests a cyst. No solid renal mass is evident. Surrounding the inferior pole of the right kidney, there is a small amount of free fluid with associated inflammatory change extending down into the right paracolic gutter. There is mild dilatation of the proximal ureter compared to the contralateral side. IMPRESSION: Distal 4 mm right ureterolith with associated moderate hydroureteronephrosis. This stone appears to be the same stone from the comparison renal CT and is migrating inferiorly. CT is negative for ureteral stone or hydronephrosis. Probable right renal cyst, recommend ultrasound to further evaluate. Mild right pelviectasis, dilatation of the right ureter and bladder calculus. These findings, in conjunction with the patient's presenting symptoms, likely represent a recently passed stone. There is no obstructive uropathy. Nonspecific free fluid and inflammatory change surrounding the inferior pole the right kidney with mild proximal hydroureter. This may be secondary to recent stone passage or alternatively early pyelonephritis. Recommend clinical correlation.