PMC6466908_01
Ultrasound finding showing a 1.3 x 1.7 x 1.1 cm focal area of ill-defined echogenicity in the midright lobe with ill-defined margins, linear echogenic areas, and internal vascularity.
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During the hospitalization, she had a thyroid ultrasound which showed an enlarged hyperemic thyroid gland consistent with Graves' disease and an indeterminate focal area (1.3 x 1.7 x 1.1 cm) in the right lobe containing abnormal linear echogenicities (Figure 1).
Pathology of the thyroid nodule. (a) Low power view of the thyroid nodule showing focus of lymphocytic predominance, consistent with thymic tissue. (b) High power view of the area of thymic tissue with Hassall's corpuscles, a pathognomonic finding for thymic tissue.
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Surgical pathology identified benign thyroid tissue with papillary hyperplasia and a benign nodule of ITT with foci of Hassall's corpuscles with calcifications (Figure 2).