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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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Plasmacytoma. (A) Axial T2W image shows a soft tissue mass lesion involving the right occipitomastoid region with predominantly iso- to slightly hypointense signal (white arrows). (B) Coronal and (C) axial noncontrast T1W images show the mass to be slightly hyperintense relative to the cerebral cortex (red arrows). (D) ADC map reveals restricted diffusion in the lesion consistent with high cellularity. (E) Coronal and (F) axial postcontrast T1W images show diffuse homogenous enhancement of the mass and invasion of the right sigmoid sinus (white arrow). By imaging, this mass is indistinguishable from a metastasis.