Lymphoid tissue, aggregates

Peyer s patches None Aggregations of lymphoid tissue found in the lowest portion of the small intestine... 

Formation of New Lymphoid Aggregates in the Inflamed Synovial Tissue... 

Lymphoid nodule A small, unencapsulated aggregation of lymphatic tissue that develops in many tissues, especially the digestive, respiratory, and unogenital tracts, collectively called gut-associated lymphatic tissue (GALT) they are the body s main sites of antibody production. 

In the Wistar rat, lymphoid aggregates of the bronchi and bronchioles varied from small collections of mononuclear cells limited to the lamina propria of the airway to large nodules that extended through the muscularis and merged into the peribronchial connective tissue or the walls of adjacent alveoli (Chamberlain et al. 1973). 

Finally, prominent peribronchial lymphoid aggregates can be present in both nonspecific and usual interstitial pneumonia patterns of injury associated with connective tissue diseases such as systemic lupus erythematosus and rheumatoid arthritis. The lymphoid infiltrate is typically denser and more diffuse in LIP. 

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