Gas containing renal stone – case report
Urology case reports, presents the tenth case of gas-containing stones in a 32-year-old female patient with no prior surgical intervention or urinary bladder catheterization. The patient presented to the emergency department complaining of right flank pain, microscopic hematuria, and previous history of passing small stones and recurrent UTI. The patient did not have any other significant medical or surgical history. Plain computed tomography (CT) of the kidneys and bladder showed 2 x 1 cm radio-opaque stone surrounded by faint high attenuation at the lower pole of the right kidney. Few tiny pockets of air were also observed between the denser part of the stone and the faint peripheral part. Another smaller obstruction stone was noted at the ureteropelvic junction, causing subsequent moderate hydronephrosis.

There was no air within the renal parenchyma or at the ureter as well as the urinary bladder lumen or wall. CT of the abdomen and pelvis in the excretory phase revealed a large filling defect at the lower pole of the right kidney, corresponding to the radiopaque stone and the surrounding faint attenuation. In addition, multiple cortical scars were noted. There was no perinephric fat stranding or free fluid. The remaining findings of the study were unremarkable. Urine analysis showed significant increase in the white blood count and the urine culture demonstrated > 100,000 CFU / mL growth of E-coli.

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