Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Slightly increased elevation of the right hemidiaphragm as compared to the most recent CT scan , could be due to true elevation or a subpulmonic effusion . Bibasilar atelectasis and small bilateral pleural effusions are unchanged . A nodular density projecting over the periphery of the left mid lung was present on the prior radiograph of ___ , but does not have a correlate on the CT from ___ and may represent a high nipple shadow or something external to the patient . Pulmonary vasculature is within normal limits . Cardiomediastinal silhouette is stable . No pneumothorax .
    OUTPUT:
    
Persistent small left pleural effusion . Apparent worsened elevation of right hemidiaphragm could potentially reflect a subpulmonic component of the right effusion . Consider a right lateral decubitus CXR for further evaluation .