The "ultrasound guided neck biopsy" sounds like the sounds like the Ultrasound guided fine needle aspiration, FNAB, which is a biopsy of a tissue sample taken from a lymph(s), and is highly accurate to identify metastatic cancer, and is considered a further diagnostic examination. I probably had 8 of them. It's a rather quick, painless procedure done mainly by a pathologist, sometimes ENT. The pathologist will look at the sample under the microscope, and can usually tell if it's cancer or not, and send it out for further histological pathology, and confirmation. My pathologist at my hospital told me on the spot it was SCC metastases, and my ENT had to speak with me, which was no surprise to us. Another pathologist at another place said it was "interesting", which I knew what that probably meant, and results were back the next day. Good luck with yours.