 The trachea and paratracheal soft tissues of the neck can be examined at the highest resolution with US probes of high frequency due to their superficial position. The anterior tracheal wall, thyroid and cricoid cartilages, tracheal rings, and pre-tracheal tissue may all be well visualized , which allows the clinician to select the optimal space for CTY tube placement. The use of US for assisting with airway management in anesthesia and in the intensive care unit is directly related to the availability of low-cost and portable US capabilities. Clinicians initially described US-guided central venous catheterization, followed by US-guided regional anesthesia techniques. Recently, a few studies examined the role of US for emergency airway procedures. Nichollas et al developed a standardized US technique to identify the CTM. The findings in this study suggest that the CTM and relevant structures can be quickly identified by emergency physicians using US technique. However this study was limited to patients with normal airway and mainly focused to the standardization of technique.20 it did not validate the technique against a gold standard. In another study Muhammad et al, reported four cases in which ultrasound was successfully used to perform percutaneous tracheostomy in the ICU .Cricothyroid membrane can easily be located on CT scan . 