Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The previous chest radiograph demonstrated a moderate - sized multiloculated pleural effusion . On the current exam , a retrosternal component of the fluid has resolved , and a basilar dependent component of the pleural effusion has significantly improved , with associated improved aeration of the left lower lobe . However , a large elliptical opacity persists , measuring ___ .5 cm in craniocaudad dimension , best visualized on the lateral radiograph overlying the mid-to - lower thoracic spine . It has obtuse angles with the adjacent lung parenchyma , consistent with a pleural location . Additionally , a discrete air-fluid level is present superiorly and has differing measurements on the PA and lateral views , also placing this within the pleural compartment . Additionally , adjacent to this pleural opacity is an area of apparent consolidation in the superior segment of the left lower lobe , just below the major fissure . Opacities in the remaining of portion of the left lower lobe are predominantly linear , suggesting atelectasis . Mild volume loss is present in the left hemithorax . The right lung is slightly overexpanded , but grossly clear , and cardiomediastinal contours are within normal limits .
    OUTPUT:
    
Although the basilar , dependent component of the left pleural effusion has improved , a large loculated pleural fluid collection is present posteriorly in the left hemithorax and now has an air - fluid level , consistent with a hydropneumothorax . Adjacent focal consolidation in superior segment left lower lobe . Considering the patient 's infectious symptoms and lack of interventional procedure to explain the air - fluid level , a chest CT is suggested for further characterization , as discussed by telephone with Dr . ___ at 9 : 26 a .m . on ___ , at the time of radiographic discovery .