CTICasesHidden Lung Tumor (Large Superior Segment Mass with Atelectasis)
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Imaging findings
Chest radiographs (PA and lateral) presented a perceptual challenge, showing a relatively large mass in the superior segment that was initially subtle on the frontal view but should have been recognized on the lateral projection as an opacity where there should normally be an empty space. The corresponding sagittal CT confirmed a large superior segment mass with attendant atelectasis.
Key takeaways
This case highlights the value of knowing anatomical landmarks on the lateral projection and demonstrates that even relatively large lesions can be subtly hidden due to their location, emphasizing that it's not just the size but also the location of a lesion that affects detectability.
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