Post Contrast T1
Lesion is soft tissue density, iso intense to cortical grey matter on T1, iso to slightly hyperintense on T2w and FLAIR images.
Faint enhancement seen on post contrast T1.
No obvious bleed or dense dystrophic calcification on T2*GRE or Fat on T1w images.
No obvious cystic component.
No sellar extension or component. Pituitary stalk and gland appear normal.
No obvious obstructive hydrocephalus due to third ventricle obliteration.
Imaging wise diagnosis: Hypothalamic Glioma.
Hypothalmaic hamartoma is unlikely as it is characterised by absence of enhancement on post contrast.
Chiasmatic Glioma is unlikely as optic chiasma seen separately immediately antero caudal to lesion.
Colloid cyst is unlikely as typical location for colloid cyst is anterior portion of third ventricle near foramen Monro.