Abstract
We report cases of two sisters with complete androgen insensitivity syndrome (CAIS). A complete female appearance, blind-ending vagina, and testes in the pelvis are characteristics of CAIS. Prophylactic laparoscopic gonadectomy was performed in both cases. Anti-Müllerian hormone (AMH) level is known to be very high in patients with CAIS; AMH is secreted by Sertoli cells and testosterone suppresses the secretion. In our cases, serum AMH was very high before gonadectomy and dramatically decreased after gonadectomy. AMH could be the diagnostic feature for patients with CAIS.