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.
Bilateral hydronephrosis, which affects both KIDNEYS, often indicates CONGENITAL ANOMALY of kidney or ureteral structure though may develop as a consequence of conditions such as HYPERTENSION (high BLOOD PRESSURE), DIABETES and BENIGN PROSTATIC HYPERPLASIA (BPH) that constricts the urethra and slows the flow of urine during urination.