Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views were obtained with patient in upright position . Comparison is made with the next preceding similar study of ___ . Comparing the frontal views , the chest findings are grossly unaltered . The on next previous examination diagnosed tiny remnant of pneumothorax in the left apical area is again observed and constitutes a linear density running parallel at 2 mm distance from the apical skeletal chest wall . Review of chest CT of ___ and also old chest CT from ___ demonstrated that the patient had some old apical scar formations , which match the linear density . A significant pneumothorax can be ruled out . It can be stated , however , that there exists a mild blunting of the left posterior pleural sinus , indicative of a small pleural effusion . This was also present on the preceding chest examination , lateral view . On the chest examination of ___ , the posterior pleural sinus was free .
    OUTPUT:
    
No evidence of remaining pneumothorax in apical area . Development of small left - sided pleural effusion in posterior pleural sinus matching patient 's trauma of nondisplaced left - sided lower rib fractures and multiple transverse process injuries as seen on chest CT .of ___ .