@missholly, The EBUS is a bronchoscopy tool with a "built-in ultrasound probe".
https://www.mayoclinic.org/tests-procedures/bronchoscopy/about/pac-20384746
The procedure is generally well tolerated. I have had three over the past four years. I know the first one used EBUS. My pulmonologist tested some lymph fluid, and knew it was cancer before I was even awake. Further tests were run on the samples to determine the specific type of cancer. Those tests can take up to two weeks if they are looking at biomarkers (the driving force of the cancer). I was a little groggy afterward from the sedation and had some coughing for a day or two.