|  |  |  |  |  | Recommended age for surgery |  |  | |
---|---|---|---|---|---|---|---|---|---|
risk category | risk level | RET codon | youngest age at first diagnosis of MTC | youngest age at first diagnosis of PCC | youngest age at first diagnosis of HPT | thyroidectomy | central lymph node dissection | recommended age to start screening for PCC | recommended age to start screening for HPT |
highest | 3 | 883 | not described | not described | - | <1 years | <1 years | 10 years | - |
highest | 3 | 918 | 9 months | 12 years | - | <1 years | <1 years | 10 years | - |
high | 2 | 609 | 5 years | 22 years | unspecified | <5 years | ≥20 yearsb | 20 years | 20 years |
high | 2 | 611 | 7 years | 30 years | unspecified | <5 years | ≥20 yearsb | 20 years | 20 years |
high | 2 | 618 | 7 years | 29 years | 41 years | <5 years | ≥20 yearsb | 20 years | 20 years |
high | 2 | 620 | 6 years | 22 years | unspecified | <5 years | ≥20 yearsb | 20 years | 20 years |
high | 2 | 630 | 12 months | - | 32 years | <2 years | ≥10 yearsb | 5 years | 20 years |
high | 2 | 634 | 13 months | 5 years | 10 years | <2 years | ≥10 yearsb | 5 years | <10 years |
high | 2 | 912 | 14 years | - | - | <5 years | ≥10 yearsb | 20 years | 20 years |
least high | 1 | 533 | 21 years | - | - | 5-10 years | ≥20 yearsb | 20 years | 20 years |
least high | 1 | 649 | 44 years | - | - | 5-10 years | ≥20 yearsb | 20 years | 20 years |
least high | 1 | 666 | 35 years | 35 years | - | 5-10 years | ≥20 yearsb | 20 years | 20 years |
least high | 1 | 768 | 22 years | 59 years | - | 5-10 years | ≥20 yearsb | 20 years | 20 years |
least high | 1 | 790 | 10 years | 28 years | - | 5-10 years | ≥20 yearsb | 20 years | 20 years |
least high | 1 | 791 | 21 years | 38 years | 38 years | 5-10 years | ≥20 yearsb | 20 years | 20 years |
least high | 1 | 804 | 6 years | 28 years | 10 years | 5-10 years | ≥20 yearsb | 20 years | <10 years |
least high | 1 | 891 | 13 years | 52 years | - | 5-10 years | ≥20 yearsb | 20 years | 20 years |