Flexible bronchoscopy (pronounced bron-kos-ko-pee) is a procedure that enables your physician or surgeon to examine the major air passages of the lungs. This allows your physician to evaluate your lungs and take small samples of tissue or fluid, if necessary. Usually the procedure is performed after you are mildly sedated and your nose or mouth is numbed. Your physician will then insert a bronchoscope, which is a flexible lighted tube about the width of a pencil, through your nose or mouth and into your windpipe. A small channel in the instrument allows tissue and fluid samples to be collected when appropriate.