Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Please note evaluation is markedly limited due to motion artifact and suboptimal penetration on the lateral film and low lung volumes . Allowing for this , there is volume loss at the left lung base with linear density most likely indicative of atelectasis . There is blunting of the left CP angle on the lateral view suggesting at least a small joint effusion . The right lung appears grossly clear . The heart size appears relatively unchanged . Mediastinal contour is normal . Bony structures appear grossly intact . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
Limited exam with left basal opacity most likely atelectasis with small left pleural effusion . Please note evaluation is markedly limited due to portable technique and if needed , a dedicated PA and lateral view may be helpful to further assess .