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Table 1 Etiologies of Systemic Venous Occlusion (SVO)

From: Managing systemic venous occlusions in children

Congenital SVO Acquired SVO
Developmental hypoplasia of systemic veins (i.e. Klippel Trenaunay syndrome hypoplastic deep veins in affected extremity) Catheter-associated obstruction
Developmental aplasia of systemic veins (i.e. IVC atresia) Hypercoagability/thrombophilia
In-utero thrombosis Mechanical obstruction (i.e. May Thurner syndrome)