a. A large right pleural effusion
b. A large left pneumothorax
c. Atelectasis of the right lung
d. Pneumonia in the right lung
e. Unilateral pulmonary edem
Correct Answer:in 23 April 10
A large right pleural effusion
Explanation
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There is opacification of the right hemithorax. There is a shift of the heart and mediastinal structures (i.e. the trachea) away from the side of opacification. This eliminates atelectasis, pneumonia and pulmonary edema as possibilities. There is never a shift of the heart or mediastinal structures toward the side of a pneumothorax. In addition, there should be no lung markings visible in the hemithorax which contains the pneumothorax. This is a large effusion which produces a mass-like effect and pushes the mediastinal structures away from the opacified side.