title: Silhouette sign due to pectus excavatum.
mesh_terms: D005260:Female; D005660:Funnel Chest / Q000150:complications / Q000000981:diagnostic imaging*; D006801:Humans; D007223:Infant; D008297:Male; D011859:Radiography; D006255:Rhinitis, Allergic, Seasonal / Q000150:complications / Q000000981:diagnostic imaging*