resembling fibrin; an eosinophilic, homogeneous, proteinacious material that is frequently formed on the walls of blood vessels and connective tissue in some patients (e.g with disseminated lupus erythematosus, scleroderma, etc.). fibrinoid necrosis - results in acidophilic (eosinophilic) deposits with staining reactions that resemble fibrin in connective tissue, blood vessel walls and other sites.