title: Two radiological observations on chest radiographs of children.
abstract: A. The frequency with which a ring shadow of the anterior bronchus could be clearly seen was investigated. The annual radiographs of the same normal children studied in another paper (Simon and Rona, 1976) were examined to see how often a small 3-5 mm ring shadow lying laterally near the upper part of the hilum could be clearly seen. This was the ring shadow most frequently seen and appears to be due to the anterior bronchus seen end on. B. In some children vessel size in the upper lobes is the same as that in the lower lobes. This tends to change to the adult pattern as the child grows older.
mesh_terms: D000293:Adolescent; D000367:Age Factors; D001980:Bronchi / Q000033:anatomy & histology*; D001995:Bronchography; D002648:Child; D002675:Child, Preschool; D006801:Humans; D008168:Lung / Q000033:anatomy & histology / Q000098:blood supply / Q000000981:diagnostic imaging*