Double-density sign

Double-density sign is seen in

[A] LA enlargement
[B] RA enlargement
[C] LA and RA enlargement
[D] RV enlargement

ANSWER

[A] LA enlargement

Also known as the double right heart border

Left atrial enlargement – Seen on frontal chest radiographs in the presence of – Left atrial enlargement

Occurs when the right side of the left atrium extends behind the right cardiac shadow,

Case courtesy of Alexandra Stanislavsky, Radiopaedia.org. From the case rID: 20314