References. 1  Shmerling RH. Approach to the patient with myalgia. http://www.uptodate.com/home. 2  LeBlond RF, et al., eds. The spine, pelvis and extremities. 3  Muscle cramps. Merck Manual Professional Version. 4  Sprains, strains and other soft tissue injuries. American Academy of Orthopaedic Surgeons.
Freebase(0.00 / 0 votes)Rate this definition: Hydronephrosis â literally water inside the kidney â refers to distension and dilation of the renal pelvis and calyces, usually caused by obstruction of the free flow of urine from the kidney. Untreated, it leads to progressive atrophy of the kidney.
Hydronephrosis is a treatable condition in which urine gets trapped in the kidney and drains slower than it should into the bladder. This causes the kidney to appear swollen. Hydronephrosis can affect one kidney (unilateral) or both kidneys (bilateral). It is often referred to as being âprenatalâ or âantenatal.â The term prenatal means the hydronephrosis was noticed in the child before birth. Antenatal means the hydronephrosis was noted after birth.