but the truth is that one can't tell whether a solid lump is cancerous or not by ultrasound alone. The ultrasound can show whether it is solid or not.

Why would they even do an ultrasound if it told them nothing at all? What was the purpose of it?

Maybe you need a second opinion ASAP. I would've hoped that any good Dr. would have reacted much quicker if they thought for one minute it was cancerous.

Good luck and keep us posted.