CTICasesDiaphragmatic Excursion Failure
Imaging findings
Fluoroscopic sniff test shows paradoxical superior motion of the right hemidiaphragm during inspiration. However, CT shows normal, symmetric diaphragmatic thickness and muscle bulk without atrophy.
Key takeaways
Paradoxical diaphragmatic motion on a sniff test indicates functional weakness but does not equate to permanent paralysis or nerve transection. The preservation of normal muscle thickness on CT suggests intact lower motor neurons and indicates potential for functional recovery.
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