Fig. 3

Histopathological staining with colloidal iron. The corneas of the proband were obtained during PKP. A, B show histopathological staining of the right cornea. Blue plaque deposits were found in the corneal stroma (A) and corneal endothelium (B). C, D show histopathological staining of the left cornea. More blue plaque deposits were found in the same layers due to complicated stromal inflammation, stromal thickening, lamellar structure disorder (C), and vascular proliferation (D). The red arrows indicate the blue plaque deposits, and the blue arrows indicate the neovascularization in the stroma. (400 ×)