3. Evaluate for Effusion – Fluid Pooling
Pooling of fluid can first be seen posteriorly. If there is enough it will then move laterally.
This is why the lateral film is most sensitive for pleural effusion. A lateral decubitis view will show the effusion in a dependent position if it is not loculated.
Right image depicts a lateral decubitis view with a small effusion
Effusion – Fluid Pooling