Inflammation of the kidney pelvis caused by coliform bacterial infection.
From 'coli' (coliform bacteria) + 'pyel-' (from Greek 'pyelos' meaning 'pelvis') + '-itis' (inflammation), combining disease terms.
This is a serious kidney infection that can develop when a urinary tract infection isn't treated—it's why doctors emphasize finishing your full antibiotic course even if you feel better!
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