Be very very careful. An abnormally high PSA or a lesion on an MRI is an abnormality and must be reported. A 'working diagnosis' of cancer is cancer for the purposes of the medical. Many patients have repeated negative biopsies, especially if not MRI guided grid biopsies, before a positive histology report. I would strongly advise reporting the abnormalities as they occur to avoid the risk of flying without a license and flying uninsured.....