PMC6936926_01
(A) IVC agenesis of the infrarenal segment (CT scan). The IVC is missing (arrow). (B) The corresponding axial image in a normal patient (arrowhead)
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It revealed agenesis of the infrarenal segment of the IVC (at the D10 level), with evidence of collateral circulation to ascending lumbar veins (Fig. 1).
Superficial varicose veins in both thighs and lower abdomen, showing the presence of collaterals involving the internal saphenous territory
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During this period, however, collateral circulation in the lower abdomen and lower limbs increased substantially (Fig. 2 and Fig. 3).