c l i n i c a l f o l i o s : n a r r a t i v e





A D V E R T I S E M E N T

 

Azygous Continuation of the Inferior Vena Cava: 1

A D V E R T I S E M E N T

   
 

Azygous continuation of the inferior vena cava (IVC) is a rare cause of widened superior mediastinum (see discussion). The enlarged azygous vein in this case is highlighted. The enlargement is compensatory for interruption of the intrahepatic portion of the inferior vena cava. The embryologic basis of this anomaly and three representative cases are presented.      

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Azygous Continuation of the Inferior Vena Cava: 2

A D V E R T I S E M E N T

   
 

By the fourth week of embryologic life, pre and postcardinal veins drain the cranial and caudal parts of the body. Interconnection and remodeling of the postcardinals with two additional sets of caudal veins establish the venous drainage of the caudal body in the succeeding four weeks. The subcardinals arise first with cephalad connection to the postcardinals.      

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Azygous Continuation of the Inferior Vena Cava: 3

A D V E R T I S E M E N T

   
 

By week 6 central intersubcardinal anastomoses are established which will become the left renal vein. The subcardinals establish connections with a caudal extension of the hepatic veins. The latter will become the subhepatic portion of the inferior vena cava. The postcardinal veins anastomose caudally and the central portions regress. The supracardinal veins appear last and bridge the gap between proximal postcardinals and the distal interpostcardinal anastomosis. The adrenal and gonadal veins are also remnants of the subcardinals.     

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This page was last modified on 5/1/2007.