I used the doctor's words. I had them chart EVERYTHING and got a copy of the chart. I then highlighted the oddball items and wrote out the history of cancers in the family. I also showed that the family member had no history of back problems, no abnormal development to cause it, and hadn't done anything lifting or otherwise to cause it.
And then I sat in the nurses station until the doctor finally took time to listen. They threatened to get security, but I just kept my head and kept pointing at the things the doctor himself wrote.
I didn't try to interpret anything, I didn't do any diagnosing myself and I didn't try to act like he didn't know what he was doing. I just kept saying that it was more serious and we needed a second opinion.
Does that help?