Heavy infiltration of the glandular tissue by lymphocytes (predominantly activated B-cells and helper T-cells) as well as plasma cells (collectively known as 'Lymphoplasmacytic Infiltrate'). Presence of reactive lymphoid follicles in the infiltrate, marked by a lack of atypical lymphoid cells (this is in sharp contrast to the presentations in lymphoma). Atrophy and loss of acini (groups of secretory cells found in the salivary glands).