Inflammation of the renal pelvis. Pyelitis: An inflammation of the kidney pelvis, the interface between the urine-secreting inner surface of the kidney and the muscular ureter that drains into the bladder. It can be caused by kidney stones or an infection that has progressed up from the lower urinary tract. It alone is a serious condition; the next stage, pyelonephritis, since it involves the whole kidney, is still worse.
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