What is the main finding?
A lobulated peripherally-enhancing mixed solid/cystic/necrotic sellar/suprasellar 2-2.5 cm mass.
What is the differential diagnosis?
Craniopharyngioma and necrotic / cystic pituitary macroadenoma are most likely. Metastasis and pituitary abscess could have similar appearances but are rare compared to the other two lesions.
What is the next investigation required?
An MRI of course, as it is able to give important insight into the composition of the mass as well as adequately visualise the optic chiasm and surrounding structures.
A lobulated peripherally-enhancing mixed solid/cystic/necrotic sellar/suprasellar 2-2.5 cm mass centred left of midline has remodelled/excavated the sellar floor, with inferior left parasellar extension. The mass compresses and elevates the optic chiasm and is intimately associated with the mildly displaced terminal left ICA and ACA A1 segment.