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- LASER photo coagulation: Use of a LASER such as the YAG or Argon to treat telangiectasia in HHT.
- LASER therapy: The acronym LASER stands for Light Amplification by Stimulated Emission of Radiation. A very intense beam of light is focused on the affected area. Used to treat telangiectases of the skin, GI tract, and nose.
- Lesion: An abnormality in an organ of the body. An AVM is a type of lesion. See AVM.
- Lobectomy: Operation to remove one lobe of the brain. There are four lobes on each side of the brain (Frontal Lobe, Temporal Lobe, Parietal Lobe, and Occipital Lobe).