hello...
i am concerned with my father.he has been diagnosed for metastatic lung carcinoma after lung biopsy,doctor told him dat cancer is in advanced stage.histopathology of biopsy showed primary cancer in lungs he also had metastasis in liver but after 2 months of biopsy my father undergo PET SCAN for confirmation of cancer as he had doubts about biopsy .PET SCAN was completely negative ,it showed neither cancer nor even metastasis anywhere in the body. i want to ask is dat possible for PET SCAN to be negative when biopsy is positive?can we rely on PET SCAN for cancer diagnosis or we should go for re-biopsy???
plzzzzzzzz give me your sincere opinion in this regard