CTICasesMiddle Lobe Displacement
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Imaging findings
In an infant with a repaired VSD, CT imaging revealed an unusual orientation of the minor fissure where the lower lobe appeared to have hyperinflated and slid in front of the middle lobe, displacing it. There was no evidence of lung torsion, but the middle lobe was compressed and displaced by the hyperinflated lower lobe segments.
Key takeaways
Structural displacement of the middle lobe due to localized hyperinflation of adjacent lobes is an uncommon but recognizable finding, particularly in infants with cardiac disease and altered thoracic mechanics. Distinguishing this from airway pathology or torsion is important for clinical management.
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