Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate right pleural effusion and associated rounded atelectasis in the right middle and lower lobes , with ipsilateral mediastinal shift , is grossly unchanged dating back to ___ study . Mild cardiomegaly is unchanged . The left lung is clear . No pneumothorax or pulmonary edema are seen .
    OUTPUT:
    
Stable moderate right pleural effusion with associated rounded atelectasis .