[Recurrent High-grade Astroblastoma Treated with Stereotactic Radiotherapy:A Case Report].

Astroblastoma is a rare, supratentorial glial tumor, occurring predominantly in children and young adults. However, treatment strategies have not yet been established for this rare disease. A 6-year-old boy presented with headache and nausea. CT and MRI revealed a left frontal mass lesion with slight edema and macrocalcifications. Gross tumor resection was performed. Histological examination found neoplastic cells with astroblastic characteristics, and a striking perivascular array of pseudorosettes. The final diagnosis was high-grade astroblastoma. MRI 13 months after surgery suggested local recurrence, and an enlargement was found 3 months later. Stereotactic radiotherapy(SRT)was performed. MRI after SRT showed enhanced cyst formation around the tumor bed, suggesting tumor recurrence. However, Astroblastoma is rare, therefore, no optimal management is known. SRT may be effective to treat recurrent astroblastomas.