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. 2021 May 22;60(23):3765–3772. doi: 10.2169/internalmedicine.5737-20

Figure 4.

Figure 4.

(a, b) A thoracoscopic biopsy specimen revealed diffuse fibrotic lesions with hyalinization and focal infiltration of lymphocytes. Hematoxylin and Eosin staining (a: ×20, b: ×200). (c) The specimen was not immunoreactive for IgG4 (×200).