Angiosarcoma

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Hello Everyone.  My Name is Paul and I am trying to get some info for my Dad.  He was diagnosed last month with angiosarcoma.  He has a mass removed from his nose and forhead and they have found spots on his lungs during a PET scan they then did a lung biopsy and determined it is cancer but they are unsure what type.  Our lives have been urned upside down since the diagnosis and  to be honest we are not sure what do or what questions to ask.  He is being seen by the VA becuase it looks like the cancer is attributed to being exposed to agent orange in Vietnam.  I know everyone here has been down the road we are just starting and I would ask for any help as to what we should ask the doctors.  He has an appointment with the Oncologist on Thursday 13 Aug.  Thank you in advance for the help.