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Annotated images show the importance of diaphragma sella/leaflets to guide radiologists the most likely origins of the sellar/suprasellar mass.
If the diaphragmatic leaflets are pushed upwards by the sellar mass, the origin is from the sella turcica. If the diaphragmatic leaflets are pushed downwards by the suprasellar mass, the origin is from the suprasellar region (possible differential diagnoses include meningioma, aneurysm, and craniopharyngioma).
The constriction of the soft pituitary macroadenoma by the diaphragmatic leaflets formed the "snowman sign".