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Histological findings of paravertebral mass in case 2. A: Hematoxylin and eosin staining, low power field; dense lymphoplasmacytic infiltration, storiform fibrosis, and hyperplastic ectopic germinal center formation were observed. B: Hematoxylin and eosin staining, high power field. C: IgG staining. D: IgG4 staining. E: CD3 staining. F: CD20 staining.
