Calcitonin-negative neuroendocrine tumor of the thyroid with metastasis to liver-rare presentation of an unusual tumor: A case report and review of literature

Figure 1 Ultrasound images of calcitonin-negative neuroendocrine tumor with cervical lymph node metastases. A: Cross-sectional image of the thyroid mass with uneven echo; B: Cross-section image of the thyroid gland with the mass invading the thyroid capsule; C: Color Doppler imaging showing abundant blood supply in the mass; D: Swollen cervical lymph node poorly demarcated between cortex and medulla.