CT findings of a rare variant of levoatrial cardinal vein resulting in complete venous ring in an adult.

An 86-year old asymptomatic male was incidentally found to have a variant of levoatrial cardinal vein (LACV) forming a complete venous ring. This is the first report of this variant. Although rare, the ability to identify LACV in the adult population is clinically significant because it may result in bi-directional shunt and the development of symptoms is an indication for intervention.