Get your CT reviewed again. opacity in suprahilar region can be a mass with adjoining lymphadenopathy
in the hilar region. Ask your radiologist
what they mean by subdiaphragmatic linear opacities.
the soft tissue
in suprahilar region may be biopsied bronchoscopically and sample can be subjected to HPE diagnosis.
You have not told about the symptoms of your father.....those pertaining to lung cancer
are: dry cough, occasionally blood streaked, there may be frank hemoptysis, wt. loss, fever etc. there may be peripheral lymph node enlarged...if it is then can be easily biopsied and diagnosis made.