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. 2022 Jun 3;64(8):1483–1509. doi: 10.1007/s00234-022-02986-x

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© The Author(s) 2022

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Fig. 11 — Invasive pituitary macroadenoma in a 60-year-old male patient with visual field defect. A huge pituitary macroadenoma (white arrows) extending into the suprasellar region through the pituitary stalk that invades the sella turcica and clivus. The “snowman” sign (white dotted arrows) is nicely depicted on coronal (a)—sagittal (b) CT sections and sagittal MRI T1W CE image (c) since the soft tumour is indented by the diaphragm sellae. This sign helps in differentiating macroadenomas from pituitary fossa meningiomas. Notice the focal erosion of the dorsal aspect of the clivus on the sagittal bone algorithm reconstruction CT image (d, white curved arrow)