“…In TBR, there are commonly multiple echogenic regions within the muscle layer that represent aberrant cartilaginous remnants. The echogenicity and feature of the cartilage vary by report, including the following: a sonolucent area in the fourth layer,1 multiple low echoic regions in the focally thickened muscularis propria layer,5 thickened hypoechoic area made of cartilaginous material,7 hyperechoic lesions just underneath the mucosa and deep in the muscle layer,4 a complete hyperechoic ring outside the esophageal wall,3 hyperechoic lesions with acoustic shadow within the thickened segment,8 and little hyperechoic areas in the muscular layer 6. In the present case, we could observe the hypoechoic muscle layer with echogenic regions during TAUS.…”