Snowman sign (pituitary macroadenoma)

Last revised by Dr Bahman Rasuli on 23 Jul 2020

Snowman sign in neuroimaging refers to the configuration of many pituitary macroadenomas. As they are soft tumors they are indented by the diaphragma sellae giving them a snowman configuration (or "figure 8" or "dumbbell" configuration). This feature helps in differentiating these tumors from meningiomas extending into the pituitary fossa.

See also

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Cases and figures

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