Final answer:
Pyonephrosis refers to the formation of pus in the kidney due to obstruction in the urinary tract. It causes severe pain and requires immediate medical attention.
Step-by-step explanation:
Pyonephrosis is a condition characterized by the formation of pus in the kidney. It typically occurs as a result of obstruction in the urinary tract, leading to the accumulation of urine and bacteria in the kidney. This can cause severe pain, fever, and other symptoms. Prompt medical intervention is required to treat pyonephrosis and prevent further complications.
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