Fig. 2

Computed tomography before and after lenvatinib treatment. a–c Computed tomography demonstrated the presence of a thyroid tumor measuring 4.3 × 3.3 cm and left cervical lymph node metastasis measuring 1.9 × 1.6 cm. The thyroid tumor widely invaded the trachea and esophagus. There was no evidence of distant metastasis. d–f. The thyroid tumor and left cervical lymph node metastasis shrank to 3.3 × 2.1 cm and 0.8 × 0.8 cm, respectively, after lenvatinib treatment