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. 2023 Jun 21;9(4):1196–1235. doi: 10.3390/tomography9040097

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© 2023 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Skull base metastasis from RCC. (A) Axial and (B) coronal CT images show a lucent destructive soft tissue density mass lesion (red arrows) involving the left occipital bone, including occipital condyle, left lateral mass of C1, and inferomedial mastoid. (C) T2W, (D) noncontrast T1W, and (E) postcontrast T1W images reveal a bulky mass (red arrows) involving the left skull base and extending to the left retropharyngeal region and left epidural space (blue arrows). The lesion shows avid enhancement with central cystic/necrotic degeneration. (F) DWI image shows hyperintense signal in the solid components of the lesion consistent with restricted diffusion due to high cellularity.