title: Systemic venous blood return via the portal vein.
abstract: The patterns of collateral circulation which develop following obstruction of the inferior vena cava have been classically divided into three groups depending upon the level of obstruction, i.e., infrarenal, middle caval, and upper caval. The portal vein can play an active role at all three levels. Multiple potential routes to the portal vein are described and 6 cases are presented.
mesh_terms: D000007:Abdominal Injuries / Q000150:complications; D000293:Adolescent; D000310:Adrenal Gland Neoplasms / Q000150:complications; D000328:Adult; D001943:Breast Neoplasms / Q000150:complications; D003097:Collateral Circulation; D005260:Female; D006801:Humans; D008297:Male; D008642:Mesenteric Veins / Q000000981:diagnostic imaging; D008875:Middle Aged; D010673:Pheochromocytoma / Q000150:complications; D011169:Portal Vein / Q000000981:diagnostic imaging* / Q000503:physiopathology; D011183:Postoperative Complications; D011655:Pulmonary Embolism / Q000601:surgery; D011859:Radiography; D012082:Renal Veins / Q000000981:diagnostic imaging; D012512:Sarcoma, Ewing / Q000150:complications; D013125:Spinal Neoplasms / Q000150:complications; D013162:Splenic Vein / Q000000981:diagnostic imaging; D013927:Thrombosis / Q000000981:diagnostic imaging* / Q000503:physiopathology; D014471:Umbilical Veins / Q000000981:diagnostic imaging; D014682:Vena Cava, Inferior / Q000000981:diagnostic imaging*