Do medullary thyroid carcinoma patients with high calcitonin require bilateral neck lymph node clearance? A case report

Table 3 Risk classification of medullary thyroid carcinoma patients based on genetic mutations (2015 version of United States thyroid association)

Risk classification	Patient population	Treatment
ATA-HST	MEN2B; RET codon M918T mutation	Thyroidectomy ± central lymph node dissection in the neck within 1 year after birth
ATA-H	MEN2A; RET codon C634 mutation	Five years old or earlier thyroidectomy ± central lymph node dissection
ATA-MOD	Others	Every year from the age of 5, physical examination, neck US, and serum calcitonin

MTC: Medullary thyroid carcinoma; ATA: United States thyroid association; RET: Reticulocytes; HST: Hubble space telescope; MOD: Medicine on delivery; US: Ultrasound.