<prompt> Which is NOT a feature of pleural effusion?Horizontal fluid levelLow lung volumeMuffled hea soundDecreased chest movements  <response>: Features of Pleural Effusion - 1. Blunting of costophrenic angle 2. Low lung volumes 3. chest movement 4. Dullness on percussion 5. Ellis curve Muffled Hea sound is characteristic feature of - Pericardial effusion Can associated with pleural effusion Horizontal fluid level is characterised feature of Hydropneumothorax 