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Pathological findings. A, B: Case 4 frozen tissue section (cornea, hematoxylin & eosin staining, original magnification 40×, 100×). B: Magnified view of boxed area with an arrow in A. Corneal tissue near the perforation. C, D: Frozen tissue section (cornea, hematoxylin & eosin staining, original magnification 100×, 200×) Corneal tissue near the perforation. The epithelium neighboring the corneal ulcer showed partial thinning (arrow).
