RET and medullary thyroid gland carcinoma: Mutations in the RET proto-oncogene and early gene testing can be detected as soon as possible,[5] this patient did not have any other endocrine system-related lesions such as medullary thyroid carcinoma, which currently does not meet the relevant diagnostic criteria of MEN2A.[1,5] It is possible that relevant symptoms have not yet appeared, and close observation and follow-up are still required.