figure-of-8 abnormality

fig·ure-of-8 ab·nor·mal·i·ty

a radiographic appearance associated with total anomalous drainage of the pulmonary venous circulation into enlarged right and anomalous left superior venae cavae, which produces a globular density above the heart; the silhouette suggests the figure 8; for example, TAPVR.
See also: anomalous pulmonary venous connections, total or partial.
Synonym(s): snowman abnormality