Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Right upper extremity PICC line and left chest wall Port - A - Cath appear unchanged in position with catheter tips both terminating in the mid to low SVC . Elevation of the right hemidiaphragm is again noted . There is mild residual bibasilar atelectasis which appears somewhat improved in the interval . A tiny left pleural effusion persists . Cardiomediastinal silhouette appears stable . No acute osseous abnormalities . No free air below the right hemidiaphragm .
    OUTPUT:
    
Mild residual basilar atelectasis with tiny left pleural effusion . Catheters appear positioned appropriately .