Fig. 4

Pathological images of thymoma. A: neoplastic tissue composed of sheets of epithelioid cells (hematoxylin-eosin staining ×100) B: mild pleomorphic nuclei admixed proliferation of small -sized lymphocytes (hematoxylin-eosin staining ×400) C: Proliferative fibrocollagenous tissue embedded within aggregates of fibroblast cells (hematoxylin-eosin staining ×1000)