Fig 4. Graph shows relative T2 hyperintensity of hypothalamic hamartomas versus 6-point pathology rating scale (1 = mostly neuronal, 6 = mostly glial). Data demonstrate increasing T2 intensity with increased tumor glial content. A sample with pathology rating of 2 and an anomalously high T2 ratio of 1.8 is the same sample seen as an outlier in Fig 3 and discussed in the text.