A 14 year old girl presents to her General Practitioner accompanied by her mother. She describes she has not progressed as far in puberty as her friends. She used to be the tallest in her class in infant school, but is now shorter than most of her peers. On examination she has stage II breast development and stage III pubic hair. Her blood pressure is 135/110mmHg in her right arm. What is the most likely diagnosis?
1) Turner syndrome
2) Klinefelter syndrome
3) Marfan syndrome
4) Prader-Willi syndrome