Dec 2016 my dad had a pet scan that showed up something on his lung and bowel. Both confirmed as cancer. They decided to remove the bowel tumour first which was successfully removed in May and no sign of cancer in his lymph nodes or blood vessels. Last Thursday he had another pet scan to see if the lung cancer had progressed. Tuesday he was told that it had shrunk back down to nothing and wasn't actually cancer and was most probably due to the pleurisy he had in November.