Inflammation of both the bladder and the renal pelvis (the funnel-shaped part of the kidney), usually from infection.
From Greek 'kystis' (bladder) + 'pyelos' (pelvis/basin) + 'itis' (inflammation). Combines two anatomical terms with the inflammation suffix.
When a urinary tract infection travels up from the bladder to the kidneys, doctors use compound terms like this to specify exactly which structures are inflamed—it's a diagnostic map written in medical Greek!
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