Tuberculous pyelitis showed deformed renal pelvis, filling defect and hydronephrosis.

结核性肾盂炎CT表现为肾盂及部分肾大盏、损及积水征。

Stagnation of urine in the kidney pelvis seems to greatly encourage pyelitis.

看起来，肾盂内尿潴留可能大大地促使肾盂肾炎的发生。