Question

If the lungs fail to empty normally during exhalation, because of either weakened elastic recoil forces or high resistance to airflow, the retained volume causes which change in the chest radiograph?

A.Flattening of the diaphragm

B.Bullae formation

C.Pneumothorax

D.Pleural effusion

Answer 1

A.Flattening of the diaphragm

• Chest radiograph also called chest X ray , is used to diagnose conditions affecting chest , its contents and nearby structures.
• Diaphragm is the main inspiratory muscle .It contract (flattens ) during inhalation , in which chest cavity enlarges .
• During exhalation the diaphragm relaxes and return to dome like shape.
• Exhalation is mainly due to elastic recoil of lung tissue , if diaphragm  remain flattened it may indicate weakened elastic recoil forces.
• Option B is wrong because bullae formation is seen in emphysema.
• Option C is wrong because pneumothorax indicate presence of air in the pleural space.
• Option D is wrong because in pleural effusion there will fluid