Pituitary Disorders USMLE Step 1 Practice Question
A 27-year-old woman presents with infertility, oligomenorrhea, and galactorrhea. Vital signs: BP 118/76, HR 88, RR 16, Temp 37°C. Laboratory evaluation reveals serum prolactin 85 ng/mL (normal <25). Thyroid-stimulating hormone and free T4 are normal. Pituitary MRI shows a 8-mm sellar mass without mass effect. She denies antipsychotic or metoclopramide use. Which hypothalamic factor normally tonically inhibits prolactin secretion?
Answer choices
- AThyrotropin releasing hormone
- BCorticotropin releasing hormone
- CSomatostatin
- DGrowth hormone releasing hormone
- EDopamineCorrect answer
- FGonadotropin releasing hormone
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