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Pingyangmycin hydrochloride (PYM) is an effective sclerosing agent to treat vascularmalformations(VM), but can easily diffuse from the injection site, which will reduce the therapeutic effect of PYM and increase its side effect.The purpose of our study was to evaluate the potential of PYM-loaded chitosan (CS) thermogels delivery system for interventional embolization therapy both in vitro and in vivo.