Q. A 16-year-old girl is brought to the physician’s office by her mother for not attaining menarche. She feels stressed about not getting periods when compared to her peers in high school. She is a nonsmoker, and nonalcoholic, and denies any recreational drug abuse. She is not on any medication. Her temperature is 98.4°F (37°C), pulse is 90/min, blood pressure is 110/80 mmHg, and respirations are 14/min. Her height is 146cm and her weight is 42 kg with a BMI of 19.7kg/m2. She has a short neck. Her breasts, axillary and pubic hair are well-developed at the Tanner stage VI. Pelvic examination shows a grossly normal vulva but the vagina ends blindly with only the urethral opening being patent. FSH levels are normal. Transabdominal ultrasonography shows the absence of a uterus. Fallopian tubes, ovaries, and kidneys appear normal on the scan. Karyotyping shows 46XX. Based on these findings, what is the most probable diagnosis for this patient?