The juxtaphrenic peak in upper lobe collapse.
Steeple-shaped shadows adjacent to the diaphragm are common in upper lobe collapse due to a variety of causes. They call attention to upper lobe collapse and should not be considered indicative of intrinsic lower lobe abnormality.
D003964:Diaphragm / Q000000981:diagnostic imaging*; D006801:Humans; D008168:Lung / Q000473:pathology; D008171:Lung Diseases / Q000000981:diagnostic imaging* / Q000473:pathology; D011859:Radiography; D012119:Respiration; D012189:Retrospective Studies