the excised tissues obtained from the eyelids and larynx in case 1 and from the corneoscleral lesion in case 2 revealed characteristic histopathologic features of sinus histiocytosis ( rosai-dorfman disease ) , including strongly positive immunoperoxidase staining for s-100 protein in the cytoplasm of most of the histiocytes .
C0019625
rosai-dorfman disease
C0019612
histiocytes