Figure 3a. Pilocytic astrocytoma with hemorrhage in an 11-year-old girl with onset of headache, nausea, and vomiting. Within 24 hours, the patient was obtunded and unresponsive. (a) Axial CT image shows hyperattenuation (arrow) consistent with hemorrhage within a vermian mass that effaces the fourth ventricle. (b) Photograph of a cut cerebellum specimen reveals a large hemorrhagic mass (m). Findings from histologic analysis confirmed pilocytic astrocytoma with hemorrhage.