Clinical data: a 69-year-old woman was referred for an evaluation of suspected thyroid cancer. The tumor evolved progressively, but relatively slowly, over 13 months.

Palpation: an enlarged, hard, fixed nodule in the right lobe of the thyroid.

Functional state : euthyroidism (TSH-level 3.14 mIU/L).

Scintigraphy: the right lobe did not take up radioiodine, while the left lobe presented normal uptake.

Ultrasonography was not performed. (The patient was examined in 1993.)

Cytological diagnosis : suspicion of malignancy not otherwise specified.

Histopathology: fibrosarcoma of the thyroid.