Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are normal . There is no pulmonary vascular congestion . New focal consolidative opacity is seen within the left lower lobe , with a trace left pleural effusion . The right lung is clear . There is no pneumothorax . No acute osseous abnormalities are detected .
    OUTPUT:
    
Findings concerning for left lower lobe pneumonia with trace left pleural effusion . Followup radiographs after treatment are recommended to ensure resolution of this finding .