Hydronephrosis is a condition characterized by the swelling or enlargement of one or both kidneys due to the accumulation of urine. This accumulation occurs when urine cannot drain properly from the kidney to the bladder, leading to the buildup of pressure within the kidney. Hydronephrosis can result from various underlying causes, including urinary tract obstructions, kidney stones, congenital abnormalities, infections, or tumors. The severity of hydronephrosis can range from mild to severe, and its symptoms may vary depending on the underlying cause and degree of kidney obstruction.
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