Need to know if a dr orders a cats can for lymph nodes before s bronscopy is it cancer.

Sounds like he's. Looking for evidence, but the only proof is a biopsy. Ct-scans reveal lumps, in lungs or the mediastinum, wher the heart, swallowing tube and lymph nodes live. Size and architecture point to or against cancer. Pet/ct follows a biopsy. They must know that there is cancer first, then look for the legitimate treatments.
Depends. It is sometimes nice to know what the anatomy looks like. It can also help the person doing the procedure. In addition, if there is something abnormal that is amenable to needle biopsy, then it may obviate the need for a bronchoscopy. Hope this helps.