title: Criteria of the silhouette sign.
abstract: The silhouette sign is a reliable sign, distinguishing anterior lung lesions from posterior or lower lung lesions. This paper has shown that the mechanism by which this occurs is not based on anatomical contact between intrathoracic structures, but on principles governing radiographic contrast, and the perception of that contrast.
mesh_terms: D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D008168:Lung / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D008297:Male; D008953:Models, Anatomic; D011014:Pneumonia / Q000000981:diagnostic imaging; D011856:Radiographic Image Enhancement; D013909:Thorax / Q000033:anatomy & histology