First-rib "fenestrations".
D000293:Adolescent; D000328:Adult; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008171:Lung Diseases / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D011859:Radiography; D012272:Ribs / Q000002:abnormalities / Q000000981:diagnostic imaging*