Cause of posterior mediastinal opacity on PA and Lateral view of chest x- ray?: (A) Bochdalek's hernia, (B) Lymph node mass, (C) Tortuous innominate artery, (D) Aneurysms
Answer is A. Anterior mediastinum - Thymona.
Middle mediastinum  - Tortuous innominate artery.
Posterior mediastinum : Bochdalek's hernia.