I think the reason why Dr. hv not discuss about other area , except for Lung, is because of condition of other area hv no changes. So, not to be so worry .
But, most of the Dr. will run thro' the complete report with patient .
Anyway, if you have the report ( prepare by the Radiology Doctor after each scan, be it X ray ; CT Scan or PET Scan ) and the film with you, you shud be able to read the report and make a comparision of the film with previous PET Scan .
Just for your information, I keep all the Scan ( X Ray / CT Scan / PET Scan ) report and film , also all blood test report . It is important for us to hv all those report , as we will need it , when we go for second or third opinion or when travelling . Those report will help other Doctor to analyse the condition and give proper opinion.