Bilateral kidney malrotation
Features of right pyelonephritis (right loin pain, fevers). Urine cultures were negative. A right renal mass was suspected on initial ultrasound (not shown).
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The study demonstrated bilateral malrotated kidneys, in which the hila face anteriorly. This is seen in both the portal venous and delayed phases.
This study demonstrated renal malrotation, which is a normal variant. Poor drainage of the collecting system because of the position of the renal pelvis, can predispose the kidney to infection (due to urinary stasis) and stone formation.