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Kidney non-tumor


Obstructive uropathy

Reviewers: Nikhil Sangle, M.D. (see Reviewers page)
Revised: 26 December 2012, last major update September 2012
Copyright: (c) 2003-2012, PathologyOutlines.com, Inc.


● Obstructive uropathy is structural or functional hindrance of normal urine flow, sometimes leading to renal dysfunction (obstructive nephropathy)
● Acute obstruction increases susceptibility to infection; chronic obstruction causes hydronephrosis
Causes: bladder neck obstruction, congenital (meatal stenosis, anterior/posterior urethral valves [Pediatr Surg Int 2009;25:613], ureteropelvic junction narrowing, urethral strictures, vesicoureteral reflux); cystocoele, inflammation, neurogenic ureter / bladder, pregnancy, prostatic hypertrophy, sloughed papillae or blood clots, stones, tumors, uterine prolapse
Symptoms: none if unaffected kidney maintains adequate function; pain due to distention of collecting system or renal capsule; early - nocturia, polyuria; after relief of obstruction, may get massive diuresis with sodium wasting
Hydronephrosis: cystic dilation of renal pelvis and calyces associated with progressive atrophy of kidney, due to obstructive uropathy

Gross description

● Thin cortical rim due to atrophy
● More calyceal dilation if incomplete obstruction, since glomerular filtration is not suppressed

Gross images

Various images

Micro description

● Initial functional alterations are tubular, cause interstitial inflammatory infiltrate
● Chronic changes are cortical atrophy, diffuse interstitial fibrosis and blunting of calyces

Micro images

Tubular atrophy, interstitial fibrosis and interstitial inflammation

Grading of obstructive uropathy

End of Kidney non-tumor > Miscellaneous > Obstructive uropathy

Ref Updated: 9/6/12

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