Complete androgen insensitivity syndrome (CAIS) is an X-linked recessive disorder resulting from an androgen receptor mutation. Affected individuals have 46,XY karyotype but female phenotype are raised as girls.1 A short vagina and absent uterus result in infertility, likely psychosexual problems and a risk of later gonadal malignancy such that gonadectomy is recommended.2 Presentation may be in adolescence with primary amenorrhoea, but 1% of premenstrual phenotypic girls with inguinal hernia (IH) will have CAIS.3 Despite current recommendations4 ,5 that all premenstrual girls with IH should be screened for CAIS, a survey6 of 32 UK paediatric surgeons found that 63% do not mention CAIS to their parents at any stage and 43% made no …