Mediastinoscopy Video Assisted Thoracic Surgery Anterior Mediastinotomy (Chamberlain procedure; anterior mediastinoscopy) Endobronchial Ultrasound with Fine Needle Aspiration (EBUS-FNA) Endoscopic Ultrasound with Fine Needle Aspiration(EUS-FNA) Transbronchial Fine Needle Aspiration (TBNA-FNA)