390) A 28 year old woman has had amenorrhea for the past 4 months. She reports having regular menstrual cycles prior to these episodes. She is sexually active and a home pregnancy test was negative on two occasions over the last one week. She denies any excessive stress or physical activity. She has had headaches almost daily over the past three months. She denies any visual deficits. Her past medical history is significant for schizophrenia for which she is using risperdal for several years with good control of her disease. On examination, her vitals are stable. Body mass index is about 28 . There is milky discharge on breast examination. Pelvic exam is normal. Serum pregnancy test is negative. A serum prolactin level is 30mcg/ml (5 to 20 mcg/L). A serum Thyroid Stimulating Hormone and Follicle Stimulating Hormone level are within normal limit. An MRI of the brain reveals 10 cm lobulated mass in the anterior skull base. Which of the following is the initial step in evaluating this patient?
A) Repeat Prolactin after Serum Dilution
B) Discontinue Risperdal
C) Trans-Sphenoidal Resection of the Tumor
D) Pituitary Irradiation
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