Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Streaky opacity at the left lung base suggests minor atelectasis or scarring . Otherwise the lungs appear clear . The cardiac , mediastinal and hilar contours appears stable . Trace pleural effusions are not excluded . The patient is status post a right shoulder hemiarthroplasty .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease .