Case 11 Table 2, Immunhistochemistry of the cornea in 2015 (left) showing brownish staining of subepithelial material in an immunoperoxidase reaction for IgG, and with agarose gel electrophoresis of the serum in 2015 (right) that confirms an MGUS-induced paraproteinemic keratopathy of IgGκ light chain type, identified with blue circles; ELP, electrophoresis; G, IgG; A, IgA; M, IgM; K, kappa light chain; L, lambda light chain.