Fig. 2
a Lingual thyroid in CT scan and MRI. A 55-year-old woman with lingual thyroid sufferred from sensation of a foreign body in the throat. Nonenhanced axial CT (left), and contrast-enhanced sagittal MRI (right) images showing a mass (red arrow) at the base of the tongue. b Lingual thyroid in SPECT/CT. A technetium-99 thyroid scan shows lingual thyroid as indicated by the green arrow. This is the same patient as Fig. 2a. c Sublingual thyroid detected with 99mTc-pertechnetate and 131Iodine. A 48-year-old man with sublingual thyroid. A technetium-99 thyroid scan (left) and 131I scan (right) showing marked uptake in submental area (arrow) and no uptake in the neck. d Dual ectopic thyroid in 99mTc sodium and 131Iodine images. This was a 6-year-old female patient. Technetium-99 m pertechnetate and 131iodine imaging revealed two ectopic foci in the lingual and submental areas simultaneously, and no orthotopic thyroid was found. e Other type of ectopic thyroid in CT and ECT. SPECT/CT imaging with 99mTcO4− reveals ectopic thyroid as indicated by arrows in the left submandibular area. This patient was a 38-year-old female. The FNAC indicated a small amount of thyroid tissues