title: Unusual variant of left superior vena cava.
abstract: The first computed tomography-documented case of a persistent left superior vena cava that drains directly into the right superior vena cava is presented. The venous embryology is reviewed and the differential diagnosis of other pertinent venous anomalies is discussed. The patient also had an incidental finding of a congenitally absent left lobe of the thyroid gland.
mesh_terms: D000015:Abnormalities, Multiple / Q000000981:diagnostic imaging; D000328:Adult; D005260:Female; D006345:Heart Septal Defects, Ventricular / Q000000981:diagnostic imaging; D006801:Humans; D013961:Thyroid Gland / Q000002:abnormalities / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed; D014683:Vena Cava, Superior / Q000002:abnormalities* / Q000000981:diagnostic imaging