Chest X ray showing infiltrate even in lordotic view one of the reason could be PTB in areas where Tuberculosis
is endemic. A sample of sputum for AFB X 3 days may be of help other clinical examination of patient as well as some blood test
like blood counts and ESR may help. Even a IgG and IgM antibody for TB or a PCR test may help to rule out PTB but other possibilities include Fibrosis
of Lung or Sarcoidosis
or ?? Malignancy.