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Hydronephrosis describes hydrostatic dilation of the renal pelvis and calyces as a result of obstruction to urine flow downstream. Alternatively, hydroureter describes the dilation of the ureter , and hydronephroureter describes the dilation of the entire upper urinary tract (both the renal pelvicalyceal system and the ureter).
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]
591 Hydronephrosis; 592 Calculus of kidney and ureter. 592.0 Calculus, kidney; 592.1 Calculus, ureter; 592.9 Calculus, urinary, unspec. 593 Other disorders of kidney and ureter. 593.2 Cyst, kidney, acquired; 593.6 Proteinuria, benign dfwpostural; 593.7 Vesicoureteral reflux, unspec. 593.73 Vesicoureteral reflux w/ nephropathy; 594 Calculus of ...
Prenatally diagnosed hydronephrosis (fluid-filled kidneys) suggest post-natal follow-up examination. The strongest neo-natal presentation is urinary tract infection.A hydronephrotic kidney may present as a palpable abdominal mass in the newborn, and may suggest an ectopic ureter or ureterocele.
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.
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]
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.
Acute tubular necrosis (ATN) is a medical condition involving the death of tubular epithelial cells that form the renal tubules of the kidneys.Because necrosis is often not present, the term acute tubular injury (ATI) is preferred by pathologists over the older name acute tubular necrosis (ATN). [1]