Clinical data: a 44-year-old woman with an enlarged mass known for several months.

Palpation: the right lobe of the thyroid was highly enlarged and a nodule was palpable.

Functional state: euthyroidism (TSH-level 1.92 mIU/L).

Ultrasonography: there was a large nodule in the right lobe while a hypoechogenic mass on the ventral surface of the lobe.

Cytological picture: there is not any colloid on the smear. Thyrocytes are in irregular clusters with nuclear crowding and overlapping. They are enlarged. Many follicular cells show groove and inclusion.

Cytological diagnosis: papillary cancer.

Histopathology: follicular variant of papillary cancer.