Renal vein thrombosis and subsequent syndrome of the vena cava inferior.

A case of what most probably was idiopathic thrombosis in the accessory and principal vein of the right kidney with the subsequent vena cava inferior syndrome is reported. The disease was complicated by clinically insignificant pulmonary embolisms. Needle biopsy discovered a fibroproductive chronic inflammatory process in the renal interstitium. Paramount diagnostic importance was attributed to retrograde cavography of the inferior vena cava.