Thyroglossal duct cyst
CT Neck with contrast
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Hypodense cystic lesion in noted resting on the superficial surface of the left lamina of thyroid cartilage insinuating itself within the strap muscles and deep to platysma. It is passing through thyro-hyoid interval at the mid-line, wraps around the inferior surface of the hyoid bone and mildly indenting the pre-epiglottic fat. The anterior jugular vein is prominent and draps along the superficial aspect of the lesion. The lesion showed mild marginal enhancement.
Thyroglossal duct cyst is the most common congenital neck anomaly. It is an anterior midline cystic swelling along the course of thyroglossal duct, more common to be infrahyoid (as in this case) and can be a little off midline. It usually presents as painless neck swelling unless infected. As we see the upper part of the cystic lesion in the sagittal image curves backwards and superiorly to reach behind the hyoid bone as this corresponds to the course of thyroglossal duct.