Mucosal Associated Lymphoid Tissues or MALT
is the diffusion 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. Is a secondary lymphoid organ, containing plasma cells that produce antibodies, T & B cells, macrophages. MALT plays a role in regulating mucosal immunity, defending against the microbes making their way through the mucous lining. It may be the site of lymphoma.