Presentation
Patient is cyanotic since birth and in respiratory distress.
Patient Data
Age: Neonate
Gender: Female
From the case:
Transposition of the great arteries
Frontal

There is globular or ovoid appearance of the heart with apparent narrowing of the superior mediastinum (egg-on-a-string sign).
From the case:
Transposition of the great arteries
Annotated image

Case Discussion
This case shows the radiographic appearance of the cardiomediastinal silhouette in a diagnosed case of D-loop transposition of the great arteries.