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Representative pathological images in thymoma patients without FBs. FBs were not observed in these patients. Images of type B3 thymoma without FBs are not shown because all patients with type B3 thymoma had FBs. (a) Type A thymoma (×1.25); (b) type AB thymoma (×1.25); (c) type B1 thymoma (×1.25); (d) type B2 thymoma (×1.25); (e) type A thymoma (×10); (f) type AB thymoma (×10); (g) type B1 thymoma (×10); (h) type B2 thymoma (×10). FBs, fibrous bands.
