Inguinal canal runs from deep to superficial rings lined by abdominal oblique muscles. Male normal contents include spermatic cord, vas deferens, and testicular structures. Female normal contents include round ligament and ilioinguinal nerve
Left renal vein impingement between aorta and superior mesenteric artery. Normal SMA-AA angle is 45°, inverted J position prevents compression. Caused by SMA and LRV anomalies, abnormal kidney drooping. Pressure gradient between LRV and vena cava can reach 3 mmHg