Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is blunting of the left costophrenic angle correlating with effusion better appreciated on the lateral projection . Additionally , there is an ovoid lucent area in the retrocardiac region on the frontal projection seen anteriorly on the lateral projection suggesting a hydropneumothorax of uncertain etiology . The left lung appears clear without focal nodule , mass , or consolidation . In the right lung base is a small nodule measuring 13 mm which may reflect a nipple shadow or alternatively a pulmonary parenchymal nodule or osseous lesion . The remainder of the lungs appear clear . No overt pulmonary edema or vascular congestion is identified . Cardiomediastinal and hilar contours are within normal limits .
    OUTPUT:
    
1 . Concern for small left - sided hydropneumothorax of uncertain etiology . 2 . 13 mm right lower lobe pulmonary nodule . Differential includes nipple shadow , osseous lesion , or pulmonary parenchymal nodule . Followup radiographs with oblique projections and nipple markers could be considered . Alternatively , CT of the chest could also be performed for further characterization of the left - sided pleural process and the right lower lobe nodule . 3 . No confluent consolidation or pulmonary edema . Dr . ___ communicated the above results to Dr . ___ at 6 :03 pm ___ ___ by telephone .