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Click 48-year-old white female with obstructive lingual thyroid. CT scan showing the pre-treatment lingual thyroid with rounded hyperdense mass at midline near base of tongue measuring 3.2 x 2.7 cm transverse, associated with narrowing of the oropharyngeal lumen to 4 mm AP. Dynamic CT with 2.5 mm thick axial sections after administration of i.v. contrast (120 ml Omnipaque 350).

Click 48-year-old white female with obstructive lingual thyroid. Axial T1 weighted spin echo images performed with fat saturation after i.v. administration of 20 ml Omniscan (gadolinium). Mass measures 3.2 x 2.7 x 2.9 cm at base of tongue at level of foramen cecum, hypointense with fairly uniform mild to moderate enhancement on T1 weighted fat saturated spin echo images.

Click 48-year-old white female with obstructive lingual thyroid. MRI showing the pre-treatment lingual thyroid. Sagittal postcontrast T1 weighted spin echo image (after i.v. 20 cc Omniscan). Mass measures 3.2 x 2.7 x 2.9 cm at base of tongue at level of foramen cecum, and is T1 hypointense.

Click 48-year-old white female with obstructive lingual thyroid. Follow up MRI (approximately 25 months after Iodine 131 ablation therapy) showing the post-treatment lingual thyroid. Previously described mass now measures 1.8 x 1.5 x 1.6 cm. T1 weighted spin echo images performed with fat saturation in axial plane after i.v. administration of gadolinium.