CTICasesLingular Collapse with Left Accessory Minor Fissure
Imaging findings
Chest radiograph shows a discrete band of atelectasis along the left lower heart border, simulating a right middle lobe collapse. CT and sagittal reformats demonstrate a left accessory minor fissure bounding a collapsed lingular segment, along with an anomalous branching pattern of the left upper lobe where the apical-posterior segment arises early.
Key takeaways
Left accessory minor fissures are anatomical variants that outline the lingular segment, allowing it to collapse independently and simulate the appearance of right middle lobe atelectasis on a lateral or frontal radiograph.
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