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{{Hydronephrosis}}
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{{SCC}}
'''Contributors:'''  [[User:zorkun|Cafer Zorkun]] M.D., PhD;{{AE}}{{Vbe}}


'''Contributors:'''  [[User:zorkun|Cafer Zorkun]] M.D., PhD.
{{SK}} Obstructive nephropathy


{{Editor Join}}
==[[Hydronephrosis overview|Overview]]==


==Overview==
==[[Hydronephrosis historical perspective|Historical Perspective]]==


'''Hydronephrosis''' is distention and [[dilation]] of the [[renal pelvis]], usually caused by [[obstruction]] of the free flow of [[urine]] from the [[kidney]].
==[[Hydronephrosis classification|Classification]]==


==Signs and symptoms==
==[[Hydronephrosis pathophysiology|Pathophysiology]]==


The signs and symptoms of hydronephrosis depends upon whether the obstruction is acute or chronic. [[Unilateral]] hydronephrosis may even occur without symptoms.
==[[Hydronephrosis causes|Causes]]==


Blood tests can show  raised [[creatinine]] and [[electrolyte]] imbalance. [[Urinalysis]] may show an elevated pH due to the [[secondary]] destruction of [[nephron]]s within the affected [[kidney]].
==[[Hydronephrosis epidemiology and demographics|Epidemiology and Demographics]]==


Symptoms that occur regardless of where the obstruction lies include [[loin]] or [[flank]] [[Pain and nociception|pain]]. An enlarged [[kidney]] may be [[palpable]] on [[examination]].
==[[Hydronephrosis risk factors|Risk Factors]]==


Where the obstruction occurs in the lower urinary tract, suprapubic tenderness (with or without a history of [[Urinary bladder|bladder]] outflow obstruction) along with a [[palpable]] bladder are strongly suggestive of [[Acute (medical)|acute]] [[urine|urinary]] [[retention]], which left untreated is highly likely to cause hydronephrosis.
==[[Hydronephrosis differential diagnosis|Differentiating Hydronephrosis from other Diseases]]==


Upper urinary tract obstruction is characterised by pain in the [[flank]], often radiating to either the [[abdomen]] or the [[groin]]. Where the obstruction is [[chronic (medicine)|chronic]], [[renal failure]] may also be present. If the obstruction is complete, an enlarged kidney is often [[palpable]] on examination.
==[[Hydronephrosis natural history, complications and prognosis|Natural History, Complications and Prognosis]]==


==Etiology==
==Diagnosis==
The obstruction may be either partial or complete and can occur anywhere from the [[urinary meatus|urethral meatus]] to the  [[Minor calyx| calyces]] of the [[renal pelvis]].
[[Hydronephrosis history and symptoms|History and Symptoms]] | [[Hydronephrosis physical examination|Physical Examination]] | [[Hydronephrosis laboratory findings|Laboratory Findings]] | [[Hydronephrosis x ray|X Ray]] | [[Hydronephrosis CT|CT]] | [[Hydronephrosis MRI|MRI]] | [[Hydronephrosis ultrasound|Ultrasound]] | [[Hydronephrosis other imaging findings|Other Imaging Findings]] | [[Hydronephrosis other diagnostic studies|Other Diagnostic Studies]]
 
The obstruction may arise from either inside or outside the [[urinary tract]] or may come from the wall of the urinary tract itself. Intrinsic obstructions (those that occur within the tract) include blood clots, stones, sloughed papilla along with tumours of the kidney, ureter and bladder. Extrinsic obstructions (those that are caused by factors outside of the urinary tract) include pelvic or abdominal tumours or masses, retroperitoneal fibrosis or [[neurological]] deficits. Strictures of the ureters (congenital or acquired), neuromuscular dysfunctions or schistosomiasis are other causes which originate from the wall of the urinary tract.
 
==Tests==
 
Blood (U&E, creatinine) and urine (MSU, pH) tests should be taken. IVUs, ultrasounds, CTs and MRIs are also important tests. Ultrasound allows for visualisation of the ureters and kidneys and can be used to assess the presence of hydronephrosis and/or hydroureter. An IVU is useful for assessing the position of the obstruction. Antegrade or retrograde pyelography will show similar findings to an IVU but offer a therapeutic option as well.
 
The choice of imaging depends on the clinical presentation (history, symptoms and examination findings).  In the case of renal colic (one sided loin pain usually accompanied by a trace of blood in the urine) the initial investigation is usually an intravenous urogram.  This has the advantage of showing whether there is any obstruction of flow of urine causing hydronephrosis as well as demonstrating the function of the other kidney.  Many stones are not visible on plain xray or IVU but 99% of stones are visible on CT and therefore CT is becoming a common choice of initial investigation.  MRI is less commonly used, often when there is a reason to avoid radiation exposure, eg in pregnancy.
 
==Complications==
Left untreated, [[bilateral]] obstruction (obstruction occurring to both [[kidney]]s rather than one) has a poor prognosis.


==Treatment==
==Treatment==
Treatment of hydronephrosis focuses upon the removal of the obstruction and drainage of the urine that has accumulated behind the obstruction. Therefore, the specific treatment depends upon where the obstruction lies, and whether it is acute or [[chronic (medicine)|chronic]].
[[Hydronephrosis medical therapy|Medical Therapy]] | [[Hydronephrosis surgery|Surgery]] | [[Hydronephrosis primary prevention|Primary Prevention]] | [[Hydronephrosis secondary prevention|Secondary Prevention]] | [[Hydronephrosis cost-effectiveness of therapy|Cost-Effectiveness of Therapy]] | [[Hydronephrosis future or investigational therapies|Future or Investigational Therapies]]
 
Acute obstruction of the upper urinary tract is usually treated by the insertion of a [[nephrostomy]] tube. Chronic upper urinary tract obstruction is treated by the insertion of a [[ureteric stent]] or a [[pyeloplasty]].


Lower urinary tract obstruction (such as that caused by bladder outflow obstruction secondary to prostatic hypertrophy) is usually treated by insertion of a [[urinary catheter]] or a [[suprapubic catheter]].
==Case Studies==
[[Hydronephrosis case study one|Case#1]]


==See also==
==Related Chapters==
*[[Urology]]  
*[[Urology]]  
*[[Urinary tract]]
*[[Urinary tract]]


{{Nephrology}}
{{Nephrology}}
{{SIB}}


[[Category:Urology]]
[[Category:Urology]]

Latest revision as of 14:13, 1 September 2018

Hydronephrosis
Ultrasound picture of hydronephrosis caused by a left ureteral stone
ICD-10 N13.0-N13.3
ICD-9 591
DiseasesDB 6145
MeSH D006869

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Steven C. Campbell, M.D., Ph.D. Contributors: Cafer Zorkun M.D., PhD;Associate Editor(s)-in-Chief: Vindhya BellamKonda, M.B.B.S [1]

Synonyms and keywords: Obstructive nephropathy

Overview

Historical Perspective

Classification

Pathophysiology

Causes

Epidemiology and Demographics

Risk Factors

Differentiating Hydronephrosis from other Diseases

Natural History, Complications and Prognosis

Diagnosis

History and Symptoms | Physical Examination | Laboratory Findings | X Ray | CT | MRI | Ultrasound | Other Imaging Findings | Other Diagnostic Studies

Treatment

Medical Therapy | Surgery | Primary Prevention | Secondary Prevention | Cost-Effectiveness of Therapy | Future or Investigational Therapies

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Case#1

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