Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a vague opacity in the left lower lung region , which obscures the left heart border and appears more conspicuous compared to prior study from outside institution performed 24 hours ago . Associated mild volume loss is present with anterior displacement of left major fissure . There is also vascular engorgement and mild interstitial edema which appears new from ___ . Small left - sided pleural effusion is also present . There is no right - sided pleural effusion . No pneumothorax is identified .
    OUTPUT:
    
1 . Focal lingular opacity , which may represent atelectasis with or without co-existing infection . Follow up CXR in 4 weeks is recommended to ensure resolution , with administration of antibiotic therapy if infectious symptoms are present . 2 . Mild interstitial pulmonary edema and small left sided pleural effusion .