PMC4900209_01
28-year-old male with middle-lobe torsion. PA (A) and lateral (B) chest radiographs demonstrate a subtle right-upper-lung zone suprahilar opacity and left-upper-lobe atelectasis associated with a luftsichel sign.
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PA and lateral chest radiographs showed left-upper-lobe atelectasis manifesting with a luftsichel sign (Fig. 1).
28-year-old male with middle-lobe torsion. Axial (A) and sagittal (B) unenhanced chest CT (lung window) shows atelectatic lung (arrow) positioned between the posterior segment of the right upper lobe and superior segment of the right lower lobe.
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Because of the radiographic abnormalities, the patient underwent unenhanced chest CT, which showed complete right-middle-lobe collapse (Fig. 2).
28-year-old male with middle-lobe torsion. Coronal (A) and sagittal (B) oblique minimu- intensity-projection (MinIP) images illustrate to better advantage the path of the narrowed middle-lobe bronchus (arrowhead). Note its course below the right interlobar pulmonary artery (*) and subsequent cranial and posterior course of the bronchi, confirming torsion of the middle lobe.
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The course of the middle-lobe bronchi was outlined with multiplanar reformatted images that documented abrupt tapering of the airway lumens and confirmed middle-lobe torsion (Fig. 3).