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FIG 1. Normal neopharynx in a 64-year-old man who underwent total laryngectomy 5 years earlier.
A, Sonogram at mid-neck level shows the ovoid neopharynx (arrows) between the subcutaneous layer of the anterior part of the neck and the cervical spine.
B, Sonogram 3 to 4 cm caudal to the level of A shows five layers around the neopharynx with alternating echogenicity. S indicates cervical spine; T, thyroid gland.
C, Diagram of B. 1 indicates innermost layer of interface and superficial mucosa; 2, inner layer of deep mucosa; 3, middle layer of submucosa; 4, outer layer of pharyngeal constrictor muscles; 5, outermost layer of adventitia; T, thyroid gland. Shaded areas are hypoechoic.
D, Axial CT scan at the same level as B shows a three-layered, round neopharynx. The thin hypodense middle layer corresponds to the submucosa (arrow). T indicates thyroid gland.
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