Testicular feminization is a syndrome due to androgen insensitivity. It occurs in a complete and incomplete form. The case of a 17 years old girl with complete androgen insensitivity syndrome is reported. Patient came to medical attention because of primary amenorrhea as the only pathology, with normal external, female genitalia. Diagnosis, findings, management and a five months follow up, are described, as well as a review of this subject.