A 10-year-old female patient with locally advanced PTC...Histopathology confirmed the presence of a PTC (diffuse sclerosing variant) with a RET-PTC3 oncogene rearrangement. The patient was started on oral lenvatinib at a dose of 14 mg daily (14 mg/m/day). After 4 months on Lenvatinib, imaging studies showed a stable thyroid mass while the pulmonary nodules appeared stable to slightly smaller without evidence of new or progressive disease.