title: Percutaneous heroin injection causing Horner syndrome.
mesh_terms: D000320:Adrenergic Fibers / Q000293:injuries*; D000328:Adult; D005260:Female; D003932:Heroin / Q000008:administration & dosage; D006556:Heroin Dependence; D006732:Horner Syndrome / Q000209:etiology*; D006801:Humans; D007267:Injections / Q000009:adverse effects* / Q000379:methods
chemical_list: D003932:Heroin