An AP chest projection (lateral decubitus position) obtained with the right side positioned against the imaging table will best demonstrate which of the following conditions?
A) Right pneumothorax
B) Right pleural effusion
C) Left pleural effusion
D) Intraperitoneal air

Question

Quizplus · Accepted Answer

When the patient is in a lateral decubitus position with the right side against the imaging table, the fluid will settle in the dependent (lower) portion of the pleural space on the right side, making a right pleural effusion more visible on the image. A left pleural effusion may be obscured by the heart or diaphragm, and an intraperitoneal air will require a different imaging modality. A pneumothorax may be better demonstrated with a different projection, such as a lateral or a PA chest X-ray.

An AP Chest Projection (Lateral Decubitus Position) Obtained with the Right