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hydropyonephrosis

(hī′drō-pī′ō-nə-frōsĭs)
n.
  1. The accumulation of purulent urine in the pelvis and calices of the kidneys, usually the result of bacterial infection following obstruction of the ureter.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.