Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . The lungs are clear of focal consolidation . There is apparent posteriorly loculated effusion seen on the lateral which localizes to the left on the frontal view and was seen on recent thoracic spine CT . The cardiomediastinal silhouette is stable noting mild cardiomegaly . Hypertrophic changes are noted in the spine with posterior fixation hardware spanning upper thoracic through upper lumbar spine . Median sternotomy wires are also noted .
    OUTPUT:
    
Persistent posteriorly loculated left effusion . No definite superimposed acute cardiopulmonary process .