Last March 10, 2015 May X -ray Result " Suspicious

last march 10, 2015 may x -ray result " Suspicious densities on right appex appecolordotic view is suggested... so i take an appecolordotic view result as " both lung appex are cleared......... and now i got and x-tray again for i had cough result " reticular densities seen on right appex..... impression ptb activity undertermined .......... what does it mean