Vocal cord palsy is not caused by:
Vertebral secondaries
Left atrial enlargement
Bronchogenic carcinoma
Secondaries in mediastinum
(a) Vertebral secondaries(Ref. Scott Brown, 6th ed., 1/12/17)Superior and recurrent laryngeal nerves are not in close proximity to vertebrae.Rest of the given (mediastinal) conditions can cause left recurrent laryngeal nerve palsy.
Larynx