<prompt> Answer this question truthfullyWhat is the function of ultrasound in detecting non-small cell lung cancer?  <response>: <reason> On endobronchial ultrasound EBUS and endoscopic ultrasound, characteristic findings of non-small cell lung cancer include enlarged lymph nodes and local invasion to adjacent bronchial structures and mediastinum. Endobronchial ultrasound is a first-line diagnostic modality for mediastinal staging. 