Snowman sign (pituitary macroadenoma)

Last revised by Hoe Han Guan ◉ on 8 Feb 2023

Citation, DOI, disclosures and article data

Citation:

Di Muzio B, Guan H, Elfeky M, et al. Snowman sign (pituitary macroadenoma). Reference article, Radiopaedia.org (Accessed on 06 Mar 2025) https://doi.org/10.53347/rID-38698

DOI:

https://doi.org/10.53347/rID-38698

Permalink:

https://radiopaedia.org/articles/38698

rID:

38698

Article created:

30 Jul 2015, Bruno Di Muzio ◉

Disclosures:

At the time the article was created Bruno Di Muzio had no recorded disclosures.

View Bruno Di Muzio's current disclosures

Last revised:

8 Feb 2023, Hoe Han Guan ◉

Disclosures:

At the time the article was last revised Hoe Han Guan had no financial relationships to ineligible companies to disclose.

View Hoe Han Guan's current disclosures

Revisions:

8 times, by 8 contributors - see full revision history and disclosures

Systems:

Central Nervous System, Head & Neck

Sections:

Signs

Synonyms:

Snowman sign in pituitary macroadenomas

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.