List four differential diagnoses of acute mediastinal widening. List three causes of mediastinal shift and the direction of the shift associated with each What are the pitfalls in the diagnosis of mediastinal widening? What is mediastinal shift? What is mediastinal widening? Which way will the mediastinum shift if there is both atelectasis and pleural effusion? Book traversal links for Mediastinal widening ‹ Which thymic tumor is most common? Up List four differential diagnoses of acute mediastinal widening. ›