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Representative microphotographs of the various tubulointersitital infiltrates in pSS. (A) Acute or chronic TIN with proteinaceous casts and atrophic tubules. (B) Granulomatous TIN. (C) Chronic TIN. (D) Chronic TIN. Magnifications: ×200 in A and B through D; ×100 (hematoxylin and eosin).
