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Click 18-year-old male with extensive DVT and infrarenal IVC agenesis. Axial CT scan on this patient imaged on a Siemens Sensation 16 CT Scanner (Siemens Medical, Forchheim Germany) scanned helically with axial reconstruction at 1.5mms, matrix size 512x512, with 120kVp and modulated mAs varying from 70 to 205. The scan was acquired following administration of non-ionic Iopamidol IV contrast triggered from the aorta with 25 second delayed imaging performed from pelvis to lung apices demonstrating a small intra-abdominal IVC and numerous venous collaterals. The two common iliac veins contain thrombus forming a small right-sided IVC. The right-sided iliac vein crosses the midline dividing and draining deep structures with collaterals noted between the psoas and iliacus muscle. A larger collateral vein with thrombus extends from this to drain the right kidney. On the left a prominent gonadal vein connects to a lumbar vein forming a bulbous region with the vein passing from here anterior to the aorta to the suprarenal portion of the IVC, also draining the left kidney. A bony sacral defect is also demonstrated.

Click 18-year-old male with extensive DVT and infrarenal IVC agenesis. Axial CT scan on this patient imaged on a Siemens Sensation 16 CT Scanner (Siemens Medical, Forchheim Germany) scanned helically with axial reconstruction at 1.5mms, matrix size 512x512, with 120kVp and modulated mAs varying from 70 to 205. The scan was acquired following administration of non-ionic Iopamidol IV contrast visually triggered over the IVC, as initial opacification of pelvic veins was somewhat poor on series 1. As per series 1 this demonstrates a small intra-abdominal IVC and numerous venous collaterals. The two common iliac veins contain thrombus forming a small right-sided IVC. The right-sided iliac vein crosses the midline dividing and draining deep structures with collaterals noted between the psoas and iliacus muscle. A larger collateral vein with thrombus extends from this to drain the right kidney. On the left a prominent gonadal vein connects to a lumbar vein forming a bulbous region with the vein passing from here anterior to the aorta to the suprarenal portion of the IVC, also draining the left kidney. A bony sacral defect is also demonstrated.