Clinical presentation: A 34-year-old woman was referred for evaluation of a thyroid nodule, which was discovered by the patient herself 3 months ago.

Palpation: a very firm nodule in the right side of the isthmus.

Functional state: euthyroidism (TSH 1.56 mIU/L).

Ultrasonography. The thyroid was echonormal. There was a moderately hypoechogenic nodule in the right side of the isthmus. The ventral part of the lesion was not separated from the sternocleidomastoid muscle. The lesion presented microcalcifications and signs of perilesional blood flow.

Cytology resulted in papillary carcinoma.

A right lobectomy was performed. Histopathology disclosed a T1N0 papillary carcinoma with a maximal diameter of 8 mm.

Comment. Although the tumor did not spread extrathyroidal, even minimal extrathyroidal growth was absent, the ultrasound pattern was highly suspicious of extrathyroidal extension.