Nutcracker syndrome: an underdiagnosed cause for hematuria?

Area of Science:

• Nephrology
• Vascular Surgery
• Radiology

Background:

• Nutcracker Syndrome (NCS), or aorto-mesenteric left renal vein entrapment, is an infrequent cause of left-sided hematuria.
• It arises from compression of the left renal vein between the abdominal aorta and superior mesenteric artery (SMA).
• This compression causes left renal venous hypertension, leading to collateral vein development and potential varicosities.

Observation:

• The primary symptom of NCS is hematuria, often accompanied by left flank pain.
• Some patients may present solely with flank pain or varicocele.
• Symptoms can be exercise-induced, and the exact cause of compression in susceptible individuals remains unclear.

Findings:

• The study reviewed literature and presented three cases of NCS.
• Cases included intermittent hematuria, asymptomatic varices found during donor screening, and an incidental finding during hypertension workup.
• These cases suggest NCS may be underdiagnosed, with variable presentations from asymptomatic to symptomatic.

Implications:

• Early consideration of NCS in the differential diagnosis of left-sided hematuria is crucial.
• Specialized diagnostic testing is necessary for accurate identification.
• Prompt diagnosis can prevent unnecessary investigations and guide appropriate management.