PMC4900051_01
23-year-old male with absent infrarenal inferior vena cava. A contrast-enhanced CT of the abdomen showed on a coronal image the absence of the infrarenal IVC (A, thin arrow) with posteriorly located paravertebral collaterals (A, thick arrow). It also showed more dilated right -sided pelvic/iliac collaterals on axial (B, white arrow) and coronal (C, black arrow) reconstructions as well as more anteriorly located pelvic collaterals to renal veins, both on the left side (C, white arrow) as well as on the right on an obliqued coronal view (D, arrows), both leading to the renal veins.
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IVC in the infrarenal region (Figure 1A). In addition, several enhancing structures were noted in the paraspinal and pelvic areas (Figure 1B, C, and D) consistent with collateral vessels.