What is indicated by rounding of the costophrenic angles seen on the posteroanterior or lateral chest film?

Question

Quizplus · Accepted Answer

Rounding of the costophrenic angles is a radiological sign indicating the presence of excess pleural fluid or pleural effusion. This is caused by an accumulation of fluid in the pleural space between the lung and chest wall, which causes the angle between the diaphragm and costal margin to become blunted or rounded on imaging.

What Is Indicated by Rounding of the Costophrenic Angles Seen