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Diagnosis: Calcification of the cricoid cartilage
The cricoid cartilage lies at the level of the sixth cervical vertebra and is the only complete cartilaginous ring of the trachea. It sits inferior to the thyroid cartilage, attached to it by the cricothyroid ligament medially and by the cricothyroid joints laterally. The cricoid is linked to the tracheal ring by the cricotracheal ligament.The rings of cartilage around the trachea, which are inferior to the cricoid, are C-shaped and not continuous. The posterior, broader part of the cricoid is known as the lamina, and the narrow anterior portion is called the arch.
Radiology Quiz Case 1: Diagnosis. Arch Otolaryngol Head Neck Surg. 2011;137(5):524. doi:10.1001/archoto.2011.64-b