A 42-year-old man presents with a suprasellar mass, shown on the post-contrast T1-weighted MRI shown here. Several years ago, he had an operation through his nose at another country. No records are available and he can not provide any additional history.

His neurological exam is remarkable for a patchy bitemporal hemianopia. Neuroendocrine testing is normal except for low testosterone.

The lesion was removed by craniotomy and the diagnosis was confirmed. Provide a differential diagnosis for this lesion.

Post-contrast MRI after surgical resection of the tumor