Thyroglossal Duct Cyst Imaging Characteristics

Diagnostic Imaging Modalities

The American College of Radiology recommends that computed tomography (CT) with intravenous contrast is indicated when a more detailed evaluation of the lesion extension is required, especially in complex or recurrent cases 1, 2
The Journal of the American College of Radiology states that CT findings characteristic of thyroglossal duct cysts include a hypodense lesion (0-20 Hounsfield units) in the midline, with peripheral wall enhancement after contrast administration 2, 3
The American College of Radiology suggests that magnetic resonance imaging (MRI) with and without contrast provides superior tissue characterization compared to CT, especially useful for differentiating thyroglossal duct cysts from other midline cervical masses 4, 5
MRI findings include a well-defined cystic lesion in the midline, typically hyperintense on T2-weighted images, with peripheral wall enhancement after contrast administration 4, 5
The American College of Radiology recommends that positron emission tomography-computed tomography (PET-CT) with fluorodeoxyglucose (FDG) is not indicated as an initial study for evaluating thyroglossal duct cysts, but may be useful in cases with suspected papillary thyroid carcinoma 2, 6

The American Academy of Otolaryngology-Head and Neck Surgery suggests that diagnostic criteria for thyroglossal duct cysts include a well-defined cystic lesion in the midline, movement with swallowing and tongue protrusion, and a typical location in relation to the hyoid bone 3
The Journal of the American College of Radiology states that differential diagnosis should consider other midline cervical masses, distinguishable by imaging characteristics and clinical presentation, including dermoid/epidermoid cysts, branchial cleft cysts, lymphangiomas, and thyroid nodules 2, 3

The American College of Radiology recommends that the Sistrunk procedure is the treatment of choice for thyroglossal duct cysts, with a recurrence rate of 3-5% when performed adequately 2
The Journal of the American College of Radiology suggests that postoperative imaging follow-up is not required if the clinical evolution is favorable, but ultrasound or CT with contrast may be indicated if there is clinical suspicion of recurrence 2

The American College of Radiology recommends that a thyroglossal duct cyst (TGDC) be considered in the differential diagnosis of a midline cervical mass, particularly in pediatric patients, due to its characteristic movement with tongue protrusion and swallowing 7

The American College of Radiology suggests that ultrasound is the preferred initial imaging modality for evaluating TGDCs, allowing for documentation of normal thyroid anatomy and identification of cystic characteristics 7
The National Comprehensive Cancer Network recommends fine-needle aspiration (FNA) if malignancy is suspected, based on characteristics such as a hard, fixed mass with rapid growth or vocal cord paralysis 8

The American Academy of Otolaryngology recommends the Sistrunk procedure as the treatment of choice for TGDC, involving excision of the cyst, central portion of the hyoid bone, and a core of deep lingual muscle to the foramen cecum, with a recurrence rate of 3-5% 7
The Annals of Oncology suggest that in cases of suspected malignancy, such as thyroid carcinoma metastasis, a more thorough diagnostic workup including FNA and potentially other imaging modalities may be necessary 9, 10

The Journal of the American College of Radiology notes that key diagnostic criteria for TGDC include a well-defined midline cystic lesion, movement with swallowing and tongue protrusion, and a typical location in relation to the hyoid bone 7
The Radiology journal highlights that differential diagnosis should consider other midline cervical masses, such as dermoid cysts, lymphadenopathy, and thyroid nodules, which can be distinguished based on imaging characteristics and clinical presentation 11, 7

Ultrasound imaging of the neck is used to document normal thyroid gland anatomy, according to the American Academy of Otolaryngology-Head and Neck Surgery 12
Thyroid function testing may be considered if there is concern about thyroid status, as recommended by the American Academy of Otolaryngology-Head and Neck Surgery, with a strength of evidence not provided 13