A 14-year-old boy presents with 3 months of lethargy, headaches, and muscle weakness. His parents note that he drinks water excessively. His vital signs are normal. A 24-hour urine collection shows polyuria. The fasting blood sugar is normal. An X-ray film of the brain reveals suprasellar calcification. An autopsy specimen of a similar case is shown in the image. Which of the following neoplasms is the most likely cause of polyuria in this patient?
- Glioblastoma multiforme
- Pituitary adenoma