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Ureterovesicular junction obstruction (UVJ obstruction) is an obstruction at the level of the ureter and bladder. It accounts for 20% of cases of hydronephrosis detected in utero. It is also most commonly seen in males and involved both sides of the urinary tract in approximately 25% of cases. [1]
The signs and symptoms of hydronephrosis depend upon whether the obstruction is acute or chronic, partial or complete, unilateral or bilateral. Hydronephrosis that occurs acutely with sudden onset (as caused by a kidney stone) can cause intense pain in the flank area (between the hips and ribs) known as a renal colic. Historically, this type of ...
The size of the renal pelvis plays a major role in the grading of hydronephrosis. Normally, the anteroposterior diameter of the renal pelvis is less than 4 mm in fetuses up to 32 weeks of gestational age and 7 mm afterwards. [2] In adults, 13% of the normal population have a transverse pelvic diameter of over 10 mm. [3]
Hydronephrosis is seen as an anechoic fluid-filled interconnected space with enhancement within the renal sinus, and normally, the dilated pelvis can be differentiated from the dilated calyces. [1] Figure 13. Hydronephrosis due to ureteropelvic junction obstruction in a pediatric patient. [1] Several conditions can result in urinary obstruction.
A pelvic kidney, also known as an ectopic kidney, is a normal kidney located in the pelvis, instead of the abdomen.This occurs when a kidney does not ascend from its original location in the pelvis to its final location during prenatal development.
Neurogenic bladder can cause hydronephrosis (swelling of a kidney due to a build-up of urine), recurrent urinary tract infections, and recurrent kidney stones which may compromise kidney function. [7] This is especially significant in spastic neurogenic bladder that leads to high bladder pressures.
Nephrosis is any of various forms of kidney disease (nephropathy). In an old and broad sense of the term, it is any nephropathy, [1] but in current usage the term is usually restricted to a narrower sense of nephropathy without inflammation or neoplasia, [2] in which sense it is distinguished from nephritis, which involves inflammation.
Features that suggest posterior urethral valves are bilateral hydronephrosis, a thickened bladder wall with thickened smooth muscle trabeculations, and bladder diverticula. [citation needed] Voiding cystourethrogram (VCUG) is more specific for the diagnosis. Normal plicae circularis are variable in appearance and often not seen on normal VCUGs.