title: Peripheral right upper lobe collapse in the newborn.
abstract: Three forms of peripheral right upper lobe collapse are described. One form has a straight or slightly concave medial border that mimicks pleural fluid. A second variety protrudes from the inferior lateral aspects of the atelectatic right upper lobe producing a triangular opacity that tapers inferiorly toward the chest wall. A third variety produces a convex medial interface with the lung that simulates an extrapleural mass or loculated fluid.
mesh_terms: D003937:Diagnosis, Differential; D006801:Humans; D007231:Infant, Newborn; D010996:Pleural Effusion; D001261:Pulmonary Atelectasis / Q000000981:diagnostic imaging* / Q000209:etiology; D011859:Radiography