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Histological findings of the resected lung.
(A) The lung tissue shows diffuse lymphoid follicular hyperplasia, lymphocyte infiltration in the alveolar septum, and macrophage and lymphocyte exudation in the alveolar space (HE stain, original magnification, × 10). (B) The lung tissue shows small lymphocytes, plasma cell infiltration, and follicular bronchiolitis in the alveolar septum (HE stain, original magnification, × 40). A: Artery, pulmonary RB: Respiratory bronchiole.
