Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views were obtained with patient in upright position . Analysis is performed in direct comparison with the next preceding similar study of ___ . Status post sternotomy , cardiac enlargement and permanent pacer with dual intracavitary electrodes unchanged . The pulmonary vasculature is not congested . There is no radiographic evidence of pleural effusion in the right hemithorax . Previously present and described left - sided pleural effusion that obliterates the entire left - sided diaphragmatic contours and reaches up to the mid portion of the left lateral chest wall remains rather unchanged . The pulmonary vasculature in the upper left - sided pulmonary area is not congested and no acute infiltrates are seen . Left lower lobe territory again obscured by the pleural densities and thus the underlying lung can not be evaluated . The most recent chest CT of ___ is reviewed and indeed the partially collapsed left lower lobe is surrounded by the pleural effusion consistent with a trapped lung syndrome . Noteworthy is , however , that at the same time widespread nodular lesions and ground - glass densities were identified in the right lung suspicious for other unrelated processes including malignancy .
    OUTPUT:
    
Stable appearance of left - sided unilateral pleural effusion .