PMC9716014_01
Color Doppler ultrasound and contrast-enhanced CT. (A) Ectopic thyroid and carcinoma nodule at the floor of the mouth (very hypoechoic area shown by the white arrow). (B, C) Ectopic thyroid gland at the base of the tongue, ectopic thyroid gland at the base of the mouth, and a single cancer nodule (the green arrow is the thyroid gland at the base of the tongue, the blue arrow is the thyroid gland at the base of the mouth, and the red arrow is a cancer nodule). (D) No thyroid gland in the normal position of the neck (white * area).
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CDU found a hypoechoic nodule of 2.3 cm x 1.7 cm x 2.1 cm in size, slightly to the right of the deep surface of the tongue base, with a honeycomb shape ( Figure 1 ). Its boundary was unclear, shape was irregular, it was connected to the tongue base mass, and its boundary with the surrounding muscle tissue was unclear ( Figure 1 ). The findings of contrast-enhanced CT scan of the neck were similar to those of CDU ( Figure 1 ).
Intraoperative findings and postoperative pathology. (A-C) Ectopic thyroid and cancer foci in the floor of the mouth. (D) Postoperative pathology showed papillary thyroid cancer.
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During surgery, we found that the ETC nodule was wrapped by ectopic thyroid tissue on the floor of the mouth and connected with ectopic thyroid tissue at the base of the tongue ( Figure 2 ). PTC ( Figure 2 ), and 1 of 12 lymph nodes had metastasis. Parathyroid hormone measurements were performed on postoperative days 1 and 3, and the results were normal.