Preferred Label : clear space sign;
Definition : Roughly triangular lucency on a frontal chest radiograph bounded by aortic arch and
descending aorta medially, pulmonary artery inferiorly, and vessels supplying left
upper lobe laterally. Convex outward contour of medial border suggests enlarged left
mediastinal lymph nodes due to neoplasia or granulomatous disease.;
Source : Eisenberg, Ronald L. Atlas of Signs in Radiology.;
Origin ID : RID35085;
Associated condition(s)
Roughly triangular lucency on a frontal chest radiograph bounded by aortic arch and
descending aorta medially, pulmonary artery inferiorly, and vessels supplying left
upper lobe laterally. Convex outward contour of medial border suggests enlarged left
mediastinal lymph nodes due to neoplasia or granulomatous disease.
