Hi my Dad has been told today following a biopsy of a lymph node in his groin and PET scan that he has carcinoma in his lymph nodes of unknown origin. Initially we thought lymphoma but that has been ruled out. CT scan and PET scan have shown no masses and only one lymph node in his coller bone and a few in his groin area with activity. I was just after anyone who could point me in the drirection of the primary cause and why this is not shown on any scans? Thanks
