Relapsing polychondritis. Report of two necropsied cases with histochemical investigation of the cartilage lesion

cartilage disruption. Regressive calcific changes with foci of hematopoiesis were noted in the trachea, larynx and bronchi procedure (PAPS), i hour blockade in 5 per cent aqueous phenylhydrazine hydrochloride was interposed between the periodic acid oxidation and exposure to Schiff reagent. Elastic tissue was stained by Verhoeff's method. Reticulin and argyrophilic fibrils were demonstrated by Wilder's silver impregnation technique.