Fig. 4

Axial (a) and sagittal (b) post-contrast T1WI shows a lung adenocarcinoma metastasis (arrowheads) to the left pre-central gyrus, which was treated with 20 Gy single fraction SRS. The sagittal plane best demonstrates that this arises anterior to the central sulcus, displacing it posteriorly. Ten months later (c & d), the lesion had resolved, but a peripherally-enhancing lesion (arrows) had developed in the adjacent post-central gyrus. This subsequently resolved without any specific treatment, confirming RN