Fig. 1From: Evaluation of the clinical value of carbon nanoparticles in endoscopic thyroidectomy and prophylactic central neck dissection through total mammary areolas approach for thyroid cancerPreoperative ultrasound-guided CN suspension injection. A CN suspension was injected by using a 1-ml syringe. B Before the CN suspension injection, the needle can be seen under ultrasound guidance. C After the CN suspension injection, a high-echo area was formed in the thyroid glandBack to article page