Which condition results from compression of the left renal vein by the superior mesenteric artery, causing venous stasis in the left kidney and left testicle?

Which condition results from compression of the left renal vein by the superior mesenteric artery, causing venous stasis in the left kidney and left testicle?

• A. May-Thurner syndrome
• B. Nutcracker Syndrome
• C. Torsion of appendix testis
• D. Varicocele

Answer: (B)

Nutcracker syndrome describes compression of the left renal vein as it passes between the superior mesenteric artery and the aorta. This obstruction raises pressure in the left renal vein and can back up into connected venous channels, including the left gonadal (testicular) vein. The result is venous stasis in both the left kidney and the left testicle, which can manifest as a left-sided varicocele along with possible flank pain or hematuria. Other conditions fit different patterns: May-Thurner involves compression of the left iliac vein by the right iliac artery and typically presents with leg DVT; torsion of the appendix testis causes acute scrotal pain; a varicocele is venous dilation from increased venous pressure but is not specifically due to renal vein compression by the SMA. The described mechanism points to Nutcracker syndrome.

Nutcracker syndrome describes compression of the left renal vein as it passes between the superior mesenteric artery and the aorta. This obstruction raises pressure in the left renal vein and can back up into connected venous channels, including the left gonadal (testicular) vein. The result is venous stasis in both the left kidney and the left testicle, which can manifest as a left-sided varicocele along with possible flank pain or hematuria.

Other conditions fit different patterns: May-Thurner involves compression of the left iliac vein by the right iliac artery and typically presents with leg DVT; torsion of the appendix testis causes acute scrotal pain; a varicocele is venous dilation from increased venous pressure but is not specifically due to renal vein compression by the SMA. The described mechanism points to Nutcracker syndrome.