Malignant progression of a pleomorphic xanthoastrocytoma in a child.

Pleomorphic xanthoastrocytoma (PXA) is a recently recognized rare cerebral neoplasm that predominantly affects young patients. We report on the case of a 3-year-old boy who presented with a 2-week history of headaches and seizures. Radiological investigation revealed a lesion in the right parietal-occipital lobe. The lesion was excised and histology disclosed the presence of a PXA with anaplastic features. 1 year later follow-up magnetic resonance imaging (MRI) revealed tumor relapse. An MRI of the spine was also performed and demonstrated leptomeningeal dissemination. The patient underwent a second operation. Histology revealed that the presence of a malignant PXA with anaplastic features. The patient received radiotherapy and 9 months later on follow-up MRI a new tumor recurrence was noted. A third craniotomy was performed and the tumor removed. Histological examination revealed dedifferentiation to glioblastoma multiforme. The patient was referred to the oncology department and received chemotherapy with temozolamide. 8 months later the patient was stable without tumor recurrence. PXAs require close follow-up because of their unpredictable biological behaviour.