Intrathyroidal Thymic Tissue in an Adolescent with Graves’ Disease: Case Report and Review of Current Literature

Table 1

Comparison of the sonographic features of intrathyroidal thymic tissue and concerning thyroid nodule.

Feature	Intrathyroidal thymic tissue	Suspicious thyroid nodule
Side	Left > right
Location	Midlower portions of lobe
Shape	Fusiform	Tall shape
	Well-defined margins	Irregular margins
Echo pattern	Hypoechoic with linear/punctate echogenic structures	Hypoechoic with microcalcifications
Vascularity	Hypovascular	Hypervascular
	Isovascular
Cervical lymph nodes	Normal	Abnormal