Cardiothoracic Imaging
Contents Anatomy Techniques Findings Cases References


Image finding: Atelectasis, right middle lobe


Follow-up radiograph


Atelectasis is the loss of lung volume and therefore a direct sign is the displacement of interlobular fissures. Generally this is accompanied by increased density and possibly elevation of the hemidiaphragm, mediastinal displacement, or compensatory over-inflation. If there has been resorption of air within the atelectatic segment, there is generally an absence of air bronchograms. The pattern of the specific lobar or segmental collapse produces relatively specific findings on the chest film, often requiring both PA and lateral films for clear and specific definition.



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December 18, 2004 (PL)
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