Among IEI causing isolated CMC, AR IL-17RA deficiency has been reported thus far in 28 cases from 16 kindreds, but AR IL-17RC deficiency has been reported in only four cases, including the current case (Case summary: Tables S3, S4) (27, 29, 30, 43–45). Here, IL17RA is linked to hyperinsulinemic hypoglycemia, familial, 4.