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. 2021 Dec 14;95(1130):20210944. doi: 10.1259/bjr.20210944

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© 2022 The Authors. Published by the British Institute of Radiology

This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 Unported License http://creativecommons.org/licenses/by-nc/4.0/, which permits unrestricted non-commercial reuse, provided the original author and source are credited.

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Figure 3. — Axial contrast-enhanced T1W (ce-T1W) and native T1W images and a cerebral blood flow (CBF) map derived from arterial spin labelling (ASL), from a patient with a brain metastasis in the left parietal lobe, treated with stereotactic radiosurgery (SRS). The lesion increased in size 1 month after SRS and was histopathologically confirmed to be a combination of subacute haemorrhage and tumour progression. Most of the lesion is hyperintense before contrast administration, due to subacute haemorrhage. This portion has no perfusion on ASL. One small component is enhancing and shows increased perfusion on ASL (arrow), consistent with tumour progression.