Preferred Label : tram line sign;
Definition : Thin, parallel shadows outside hilum on a radiograph. Suggests chronic bronchitis
or asthma with bronchiectasis, thick bronchial walls, peribronchial fibrosis, and
distal collapse.;
Source : Eisenberg, Ronald L. Atlas of Signs in Radiology.;
Origin ID : RID35647;
Associated condition(s)
Thin, parallel shadows outside hilum on a radiograph. Suggests chronic bronchitis
or asthma with bronchiectasis, thick bronchial walls, peribronchial fibrosis, and
distal collapse.
