Idiopathic multicentric Castleman disease with pulmonary and cutaneous lesions treated with tocilizumab: A case report

Figure 2 Histopathology of the lung (A and B), skin (C and D), and lymph node (E and F). A, C, and E: Hematoxylin and eosin (H&E) × 50; B, D, and F: H&E × 400. A and B: Fibrous tissue hyperplasia accompanied by infiltration of a few lymphocytes and plasma cells in the lung; C and D: The epidermis was basically normal, lymphoid follicular-like hyperplasia was observed in the superficial and deep layers of the dermis, and medium-density plasma cells and lymphocytes infiltrated around the blood vessels and glands with no atypia; E and F: Reactive lymphoid hyperplasia mainly occurred in the paracortical region, and plasma cells mainly infiltrated in the medulla region. The structure of the lymph node was intact, and no transparent small angiogenesis was found.