===Choice of modality===
*'''[[Ultrasonography of the thyroid]]''' is generally the initial investigation of choice for the thyroid.
*'''[[CT of the thyroid]]''' plays an important role in the evaluation of thyroid cancer.<ref name=Saeedan2016Saeedan2016template>Originally copied from: {{cite journal|last1=Bin Saeedan|first1=Mnahi|last2=Aljohani|first2=Ibtisam Musallam|last3=Khushaim|first3=Ayman Omar|last4=Bukhari|first4=Salwa Qasim|last5=Elnaas|first5=Salahudin Tayeb|title=Thyroid computed tomography imaging: pictorial review of variable pathologies|journal=Insights into Imaging|volume=7|issue=4|year=2016|pages=601–617|issn=1869-4101|doi=10.1007/s13244-016-0506-5}} [https://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International License]</ref> When performed for other reasons, it often incidentally detects thyroid abnormalities, thereby practically becoming the initial investigation.*'''[[MRI of the thyroid]]''' can be used in the evaluation of thyroid cancers and goiter, and likewise detects incidental abnormalities.<ref name=Saeedan2016template/>