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Fig. 1 | Radiation Oncology

Fig. 1

From: Sacral insufficiency fractures after high-dose carbon-ion based radiotherapy of sacral chordomas

Fig. 1

47-year-old man with an extended sacral chordoma (black star) as shown on axial T1- and T2-weighted MR-images before definitive radiotherapy (a, b, c), and on the planning CT with the corresponding dose distribution (d and e). The post-treatment MRI 12 months after radiation shows sacral insufficiency fractures in both massae laterales of the sacrum (white arrows) with corresponding hypointense linear signal abnormalities on both T1- and T2-weighted MR-images (f and g). The T2-weighted axial images (g) additionally depict the surrounding hyperintense bone marrow edema (yellow stars) which mimics tumor progression

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