Hello Gt9915 and thanks for posting,

I can appreciate how unsettling this this been, but try not to over think it and bear in mind what the nurse said. This scan appointment at Great Ormond Street could just be routine and have something to do with the way children's services are configurated in London. Perhaps Great Ormond Street has different sonography scanning equipment and this is why the doctors have asked for a scan there. The doctors are probably being thorough which is no bad thing. 

It is worth saying that testicular cancer is very rare in a chid of your son's age so it would be an unlikely reason for the lump. 

I realise that having to waiting can be worrisome, try not to read anything into this appointment and hold your nerve.

Give us a ring if you want to talk anything over, our number is Freephone 0808 800 4040 and we are around weekdays 9-5. 

Best wishes,

Julia