title: Pulmonary vascular nodules: new sign of left lower lobe collapse in children.
abstract: Left lower lobe collapse can be suspected in children on a frontal chest film when three or more peripheral left upper lobe vessels are seen end-on along the left heart border. The peripheral vascular changes are mainly due to the backward and downward displacement of the hilus. This "vascular nodule sign" was evident in 25 (70%) of 36 cases of left lower lobe collapse. Its frequency in normals is less than 10% and may be accounted for by lordotic projection. Although not entirely specific, this sign, easily noticeable even on an underexposed film, should raise the possibility of left lower lobe collapse.
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D005260:Female; D006330:Heart Defects, Congenital / Q000000981:diagnostic imaging; D006801:Humans; D007223:Infant; D008168:Lung / Q000098:blood supply*; D008297:Male; D011187:Posture; D011651:Pulmonary Artery / Q000000981:diagnostic imaging; D001261:Pulmonary Atelectasis / Q000000981:diagnostic imaging*; D011859:Radiography