 Bedside ultrasound is increasingly being used to assist anesthesiologists in performing various procedures.The use of ultrasonography US has been shown to significantly reduce complications and improve outcomes.Diagnostic application of US for upper airway anatomy and its role for the performance of CTY and bedside tracheostomy has been previously described .However, little is known on the reliability and validity of the US when compared to the gold standard CT scan in identifying the CTM. 