Had ct scan on neck during sinus infection. dr found enlarged lymph nodes on scan. said he couldn't tell size of them so referred me to ultrasound. y?

Contrast CT?: If your ct scan was done without contrast, it may be difficult to accurately measure the size of nodes, as they can blend into surrounding structures. A repeat study with intravenous contrast would be preferable to an ultrasound, which cannot see the entire anatomy of the neck. If the nodes are symmetrically enlarged and aren't larger than 12-15mm, they are likely reactive, not pathologic.