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The mucosa-associated lymphoid tissue (MALT) (also called mucosa-associated lymphatic tissue) is a diffuse system of small concentrations of lymphoid tissue found in various sites of the body, such as the gastrointestinal tract, thyroid, breast, lung, salivary glands, eye, and skin. D-MALT (diffuse mucosa-associated lymphatic tissue); MALT that is not organized as a separately macroscopically anatomically identifiable mass, tissue or organ (such as the aforementioned O-MALT) is diffuse MALT.
The term mucosa-associated lymphoid tissue (MALT) is used to describe lymphoid tissue which is found along the mucosa. Lymphoid tissue is part of the lymphatic system which drains fluid, filters out harmful substances and helps protect the body from infection. Mucosa is the tissue that lines spaces and passages such as the stomach and intestines.