Figure 1.

Seven-year-old girl with an anaplastic ependymoma. This case represents an example in which both neuroradiologists provided the correct diagnosis and in which ADC values indicated a correct diagnosis. A) Axial FLAIR image shows a heterogenous mass extending out of the left foramen of Luschka, typical of an ependymoma. B) Axial contrast-enhanced T1-weighted image shows the mass contrast enhances in an inhomogenous manner. C) Axial diffusion-weighted image shows the mass is relatively isointense to normal brain. D) Axial ADC map at the same level as C shows the lesion has a bright signal, consistent with elevated diffusivity. Mean ADC_min value measured by one observer was 1.047 mm²/s and that by the other observer was 1.064 mm²/s, suggesting that the diagnosis was not that of medulloblastoma.