title: [A mediastinal opacity peculiar to children: the thymus].
mesh_terms: D002675:Child, Preschool; D003951:Diagnostic Errors; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D011012:Pneumomediastinum, Diagnostic; D013902:Radiography, Thoracic; D013950:Thymus Gland / Q000000981:diagnostic imaging*
vernacular_title: Une opacité médiastinale particulière à l'enfant: le thymus