In our series, Costello syndrome or CFCS syndrome were initially suspected in 6 patients with NSLAH (3 with the recurrent SHOC2 alteration and 2 with the SHOC2 alteration and another with a pathogenic PPP1CB alteration, respectively; see Table 2 and Supplemental Table S1). The gene discussed is PPP1CB; the disease is Noonan syndrome-like disorder with loose anagen hair.