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  Indian J Med Microbiol
 

Figure 3: (a) Initially, the upper border of arch of aorta is located. The arch of aorta is about 2 cm in diameter and identified approximately at 20–22 cm distance from incisor. (b) The trachea lies in front of esophagus and the presence of air in trachea interfere with imaging during EUS. The trachealis muscle lies in the posterior wall of trachea. The sound waves are transmitted through the muscle, and reverberation artifact of air in the lumen of trachea is produced as a white line in front of esophagus. Even in this image, small areas of cartilage are seen in the posterior wall of trachea. (c) On a clockwise rotation to either side, the rings of the trachea can be more easily appreciated (yellow arrows). (d) The alternating pattern of hyperechoic spine and hypoechoic intervertebral disc can be traced all the way to the base of skull by a pullout along the posterior wall of esophagus and pharynx

Figure 3: (a) Initially, the upper border of arch of aorta is located. The arch of aorta is about 2 cm in diameter and identified approximately at 20–22 cm distance from incisor. (b) The trachea lies in front of esophagus and the presence of air in trachea interfere with imaging during EUS. The trachealis muscle lies in the posterior wall of trachea. The sound waves are transmitted through the muscle, and reverberation artifact of air in the lumen of trachea is produced as a white line in front of esophagus. Even in this image, small areas of cartilage are seen in the posterior wall of trachea. (c) On a clockwise rotation to either side, the rings of the trachea can be more easily appreciated (yellow arrows). (d) The alternating pattern of hyperechoic spine and hypoechoic intervertebral disc can be traced all the way to the base of skull by a pullout along the posterior wall of esophagus and pharynx