PLAIN RADIOGRAPHIC DIAGNOSIS OF CONGENITAL HEART DISEASE

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2g-1. Transposition of the Great Arteries (D-TGA).  (Condition description.)

A. The heart is enlarged with a narrow "pedicle" giving the so called "egg on a string" appearance. The superior mediastinum appears narrow due to the antero-posterior relationship of the transposed great vessels and "radiologic-absence of the thymus".