May Be Caused by

Alpha1-antitrypsin deficiency

Alström syndrome

Aneurysmal venous dilatation

Banti syndrome

Budd-Chiari syndrome

CREST syndrome

Cruveilhier-Baumgarten syndrome

Ehlers-Danlos syndrome

Fabry syndrome

Idiopathic dilatation of thoracic systemic veins

Inferior vena cava syndrome

Klippel-Trénaunay-Weber syndrome

Maffucci syndrome

Marfan syndrome

Nutcracker syndrome

Occipital horn syndrome

Osler-Weber-Rendu syndrome

Pelvic congestion syndrome

Splenic vein thrombosis

Superior vena cava syndrome

Turner syndrome