NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 8,390 terms related to cancer and medicine.
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- varicose vein
- listen (VAYR-ih-kose vayn)
- A condition in which a vein, most often in the legs, becomes permanently enlarged, twisted, and painful. This may be caused by valves in the vein that don’t work properly or by weakness in the vein walls.