Case Study - April 2008

This is a CT scan of a 52 year old man who presented in an intoxicated state with a self-inflicted laceration to his lower limb. He developed right loin pain whilst in the Accident & Emergency Department.

  1. What does the CT scan show?
  2. What risk factors may be relevant in this patient?
  3. What management options are available?

Case presented by Mr Oliver Wiseman

Reveal Answer

Open answer There is no fixed answer to this question, however your response should be similar to the one below:

  1. There is a large area of reduced attenuation within the right kidney without any mass. This appearance is compatible with a diagnosis of a renal infarct. The infra-renal abdominal aorta is narrowed by atheroma. The left kidney enhances normally.
  2. The commonest cause of renal infarction is renal artery thromboembolism originating either locally or within the heart. Important risk factors are smoking, diabetes, hypertension, family history of IHD, hypercholesterolaemia, obesity. A previous history of rheumatic heart disease, atrial fibrillation, infective endocarditis or myocardial infarction is also significant. Other less common causes include trauma, thrombophilias (including Protein C and S deficiency), sickle cell disease and scleroderma.
  3. The management of renal infarction is controversial due to the paucity of comparative clinical trials into this rare condition. In recent years the general trend has been to use localised fibrinolysis, which has the benefits of targeted therapy with a reduction in the bleeding complications associated with systemic therapy. This technique involves the insertion of thrombolytic agents such as streptokinase, urokinase or tissue-type plasminogen activator into the renal artery during angiography. This should be followed by the long-term use of heparin or warfarin therapy to decrease the risk of further thrombus formation along with secondary prevention of associated peripheral vascular disease risk factors.

Whilst clot lysis is successful in the majority of patients, long-term renal function is preserved in only 50% of patients because of delays in diagnosis and institution of treatment beyond the warm ischaemia time of the kidney (60-90 minutes). Return of renal function to normal is also dependent upon the degree of occlusion of the artery, with sudden complete obstruction causing permanent damage even with treatment. Patients with incomplete occlusion or obstruction at the level of segmental branches, with a good collateral circulation, may result in preservation of renal function even if treatment is instituted many hours later.

Surgical options include embolectomy, angioplasty, aorto-renal bypass, renal autotransplant and vascular excision with end-to-end anastomosis. Their use is generally limited to cases of simultaneous bilateral renal infarction.

The magnetic resonance angiogram (MRA) below shows occlusion of the right renal artery with associated irregularity of the lower abdominal aorta and stenoses at the origins of both common iliac arteries.

illustrative image for answer to question $n

The cookie setting on this website is set to ‘allow cookies’ to give you the very best experience.

If you continue without changing this setting, you consent to this - but if you want, you can change your setting at any time using the ‘change cookie setting’ link at the bottom of this page.

Cookie Setting

Our Cookies

Cookie NamePurpose
eu_ask This is used to store the cookie setting you set in the form above.
If you choose 'Do Not Allow Cookies' we will need to store this information as a cookie with the value N.
If you choose 'Allow Cookies' or do not make a choice, we will store this information as a cookie with the value Y.

The value is kept for one year.

3rd Party Cookies

Cookie NamePurpose
Google Analytics This website uses Google Analytics, a web analytics service provided by Google, Inc.
Google Analytics sets a cookie in order to evaluate your use of the website and compile reports for us on activity on the website.
Google stores the information collected by the cookie on servers in the United States.
Google may also transfer this information to third parties where required to do so by law,
or where such third parties process the information on Google's behalf.
Google will not associate your IP address with any other data held by Google
By using this website, you consent to the processing of data about you by Google in the manner and for the purposes set out above.

How to reject or delete this cookie