Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is top normal . There is mild widening of the mediastinum , as well as fullness of the aortopulmonary window . The retrosternal clear space appears less lucent than expected raising the possibility of been a anterior mediastinal abnormality . No focal consolidations concerning for pneumonia are identified . There is no pleural effusion , or pneumothorax . The visualized osseous structures are unremarkable .
    OUTPUT:
    
1 . No acute intrathoracic abnormalities identified . No pneumothorax . 2 . Mild widening of the mediastinum , with associated convexity of the aortopulmonary window , atypical in a patient of this age . Alhtough possibly due to prominent mediastinal fat ( lipomatosis ) , a nonurgent chest CT is recommended for further evaluation , to exclude malignancy such as lymphoma .