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Lumen is the internal size or diameter of the trachea (windpipe). Narrowing means that it is smaller for some reason. A main reason for narrowing is inflammation as in Asthma or Allergies. Narrowing can also happen with intubation as the trachea adapts to the size of the breathing tube over time.

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Q: What us the abnormal narrowing of the lumen of the trachea?
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