Bilateral recurrent laryngeal nerve palsy is seen in all except
Thyroid surgery, Carcinoma thyroid, Cancer of cervix, oesophagus and Cervical lymphadenopathy are the causes of Bilateral recurrent laryngeal nerve paralysis Ref: PL Dhingra Textbook of Ear, Nose and Throat, Edition 6, page - 299
Thyroid carcinoma
Lymphadenopathy
Thyroid surgery
Aoic aneurysm
Larynx