Which differential diagnosis for this prominent pituitary stalk appearance can be entertained?
For this patient, the differential would include tumours such as CNS lymphoma and pituitary metastases, infection such as CNS tuberculosis, and cellular infiltrates such as neurosarcoidosis.
The pituitary gland and its infundibulum are diffusely and homogeneously enlarged and demonstrate intense enhancement. No pituitary suprasellar extension is noted. The enlarged infundibulum compresses the optic chiasm inferiorly, and mild oedema is seen proximally in the chiasm. Mildly restricted diffusion is observed within the infundibulum. No signs of cavernous sinus invasion.