Aims and objectives
The thyroglossal duct is a narrow tubular structure connecting the primordium of the thyroid gland to the tongue in the midline.
If the duct does not involute at 8-10th weeks of gestation,
secretion for infection or inflammation causes a thyroglossal duct cyst (TDC).
TDC accounts for 70% of all congenital neck anomalies.
The aim of this paper is to describe MR and CT findings of TDC including 3d MR sequences and a rare branchedthyroglossal duct cyst.
Methods and materials
7 patients (6 male,
age range 15-62 years) werediagnosed a TDC by CT and MRI.
5/7 lesions were thyrohyoid,
1/7 was suprahyoid,
1/7 was lingual.
4/7 lesions were median-paramedian located on the right,
2/7 on the left,
1/7 on the midline in the preepiglottic.
1/7 lesion was a rare variant of branched thyro glossal duct cyst.
On CT TDC had a liquid density content with a thin wall enhancing after contrast medium injection.
On MRI the TDC content intensity was variable,
generally intermediate or low on T1,
and high on T2,
but in 1/7 lesion the intensity was intermediate -...
Differential diagnosis with other cystic lesion of the neck and accurate location assessment of TDC for preoperative purposes is essential.
For this aims CT and especially MRI with 3D sequences are effective imaging modality.
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