What does "Lumen" mean in a report or doctor's letter? In our medical dictionary, you will find a patient-friendly explanation of the meaning of this medical term.
In medicine, "lumen" refers to the inside space of a tubular structure, like a blood vessel or intestine. It's similar to the inside of a garden hose - it's the channel where water, or in the body, blood or other fluids, can flow through. The size of the lumen can change, for example, it can become narrower due to disease. This term is used by doctors to describe and understand the conditions of these structures in the body.
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