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  • Magnetic Resonance Imaging (MRI): A computer-assisted imaging technique that is free of radiation (unlike CT Scans). Sometimes, an MRI may be done using a contrast dye in order to enhance specific body structures. Images are produced in cross-sectional pictures of the part of the body being scanned. MRI Scans are used to view soft tissue and bone, including a wide variety of problems; for example, fractures, tumors, abdominal problems, and some nerve problems can all be examined via MRI.
  • Malabsorption:  Difficulty absorbing nutrients from food or liquids.
  • Mast Cell: A cellular component of the immune system that resides in tissue. When attached to an IgE-Antibody combination, releases mediators (degranulates) in allergic reactions, including leukotrienes, histamine and other chemicals.
  • Mast Cell Stabilizer: A type of medication that helps prevent mast cells from releasing allergic reaction mediators.
  • Mepolizumab: A monoclonal antibody medication that works by blocking the action of a certain natural substance in the body that causes the symptoms of asthma.
  • Metabolic Disorder: A medical condition in which the body has difficulty converting food to energy. Metabolism is complex set of chemical reactions that lead to energy production or storage. People with metabolic disorders have an abnormal chemical reaction that disrupts metabolism.
  • Motility: The coordinated neuromuscular activity of the wall of the GI tract that moves intestinal contents.
  • MRI: See Magnetic Resonance Imaging.
  • Mucosa: The innermost layer of the esophagus, stomach, small and large intestines. This layer is visible on endoscopic or colonoscopic examination. The submucosa is just underneath the mucosa. The mucosa and submucosa can be biopsied via colonoscopic or endoscopic procedure.
  • Muscularis: The middle layer of the esophagus, stomach, small and large intestines.