Retrocardiac sail sign
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At the time the article was created Bálint Botz had no recorded disclosures.View Bálint Botz's current disclosures
At the time the article was last revised Daniel J Bell had no recorded disclosures.View Daniel J Bell's current disclosures
The retrocardiac sail sign represents the characteristic and highly specific appearance of left lower lobe collapse on a frontal chest x-ray.
The collapsed, medially displaced left lower lobe is represented by a triangular area of increased density with sharp margins, superimposed on the heart shadow which resembles the unfurled sail of a yacht. The heart contours remain preserved (no silhouette sign), while the contour of the left hemidiaphragm is at least partially effaced 1.