Fig. 15.

a Double IVC with hemiazygos continuation of the IVC schematic. Resulting from the persistence of the in-between segment of the supracardinal vein that connects both the IVC and the azygos-hemiazygos system. b Double IVC with hemiazygos continuation of the IVC imaging. MR angiography [A—axial plane, B—coronal plane, C—volumetric 3D reconstruction] showing double IVC with hemiazygos continuation of the left-sided IVC, in which (“1”)—normal right-sided IVC and (“2”)—hemiazygos continuation of the left-sided IVC