Diseases: Reactive; Hodgkin's; Non-Hodgkin's; Metastatic; Miscellaneous; Features: Follicular features; Follicular mantle zone; Sclerosis/fibrosis; Other patterns/nodules; Vessels; Necrosis/giant cells; Histiocyte/epitheloid; Plasma/eosino/neutro; Distinctive cells/struct; SR and SR-like cells; LLC/MLC/SLC/mitotic fig; Cluster of lymphoid cell; Metastatic /leukemic cells; Labs, stains, & organisms; Immunology; Molecular biology; Clinical Features. Features: Follicular features. Follicular mantle zone. Sclerosis/Fibrosis. Other patterns/Nodules. Vessels. Necrosis/Giant cells. Histiocyte/Epithelioid. Plasma/Eosino/Neutro. Distinctive cells/struct. SR and SR-like cells. LLC/MLC/SLC/Mitotic fig. Clusters of lymphoid cell. Metastatic/leukemic cells. Labs, stains, & organisms. Immunology. Molecular biology. Clinical features.