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The longitudinal “string of pearls” technique and the transverse “thyroid-airline-cricoid-airline” (TACA) protocol to identify the CTM. (A) String of pearls with cricoid cartilage (asterisk). (B) “T” in “TACA” with outline thyroid cartilage (dashed lines). (C) “A” in “TACA” with hyperechoic CTM (solid arrow). (D) “C” in “TACA” with hypoechoic cricoid cartilage (solid arrow). (E) “A” in “TACA” with hyperechoic CTM (solid arrow).
