A 70-year-old woman is referred to an ophthalmologist because of difficulty with her right eye. she also has pain in the right upper chest. the findings on pe include enophthalmos, meiosis, anhidrosis, and ptosis. a chest x-ray shows right upper lobe opacification and bony destruction of the right first rib. a biopsy of the mass shows bronchogenic carcinoma. the clinical presentations described are consistent with features of which of the following