This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: ENT
Right sided vocal cord palsy seen in: 
Select and explain. 
A. Larynx carcinoma, B. Aoic aneurysm, C. Mediastinal lymphadenopathy, D. Right vocal nodule
A: Larynx carcinoma
Answer: A: Larynx carcinoma 
Explanation: Lt RLN.: Arises from vagus in the mediastinum at the level of arch of aoa loops around it and then ascends into the neck. Rt. RLN: Arises from vagus at the level of subclan aery, hooks around it and then ascends up. So, any mediastinal causes viz mediastinal lymphadenopathy and aoic aneurysm would parlyse Lt. RLN. only Vocal nodule does not cause vocal cord palsy. Laryngeal carcinoma especially glottic can cause U/L or B/L Vocal Cord paralysis - Conn's Current Theory