Preferred Label : upper triangle sign;
Definition : Triangular shadow continuous with the mediastinum pointing toward the hilum in the
right upper lung on a frontal radiograph. Suggests lower lobe collapse with mediastinal
shift.;
Source : Eisenberg, Ronald L. Atlas of Signs in Radiology.;
Origin ID : RID35674;
Associated condition(s)
Triangular shadow continuous with the mediastinum pointing toward the hilum in the
right upper lung on a frontal radiograph. Suggests lower lobe collapse with mediastinal
shift.
