Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA frontal and lateral chest radiographs demonstrate an well - expanded lungs . There is no focal consolidation . There is a small left - sided pleural effusion with atelectasis of the left base . The hilar and mediastinal is better appreciated on CT dated ___ . There is no pneumothorax . No pneumoperitoneum is identified on this upright radiograph .
    OUTPUT:
    
Left basilar atelectasis . No intrathoracic findings to account for recurrent abdominal pain .