Figure 3
From: Surgery for recurrent inflammatory pseudotumor of the lung
Histopathology of the first surgical specimen. A, Lymphoid hyperplasia with germinal centers and exudative changes. B, Proliferation of collagen fibers and destruction of alveolar elastic fibers (left, hematoxylin and eosin staining; right, Elastica-van Gieson staining). C, Infiltrating lymphocytes and plasma cells without atypia. D, Lymphocytic infiltration of vascular walls (left, hematoxylin and eosin staining; right, Elastica-van Gieson staining).