Fig. 18.

a Axial T1-weighted sequence in a 45-year-old woman with a 5-day history of headaches demonstrates a large, extra-axial mass centred on the falx that bulges laterally with convex margins to indent the paramedian frontal lobes bilaterally. There is heterogeneous hyperintensity within the mass consistent with intratumoural haemorrhage with subdural haemorrhage extending anteriorly and posteriorly away from the mass along the falx. Histology at surgery was a meningioma (grade I). b Post-contrast axial T1-weighted sequence in the same patient as a demonstrates mildly heterogeneous enhancement of the non-haemorrhagic component of the mass