Androgen Insensitivity Syndrome (AIS) is a disorder wherein a patient presents with a female phenotype but is actually genetically male with an XY karyotype. Typically, AIS is diagnosed at the beginning of second decade, when a phenotypically female patient complains of amenorrhea. It is extremely rare to make a first diagnosis of AIS after the fifth decade of life. This case report presents a 62-year old female who consulted because of primary amenorrhea and intraabdominal mass. Patient was diagnosed with Complete Androgen Insensitivity Syndrome based on physical exam findings, imaging studies, endocrine tests and karyotyping. She underwent exploratory laparotomy, adhesiolysis and bilateral orchiectomy. This report will discuss diagnosis and appropriate management of patients with Complete Androgen Insensitivity.