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Pediatric oligodendroglioma with sequential biopsies. Histopathologic analysis of cases with sequential biopsies demonstrated persistent low-grade features in most of these tumors. For example, the tumor from this patient (case 27) showed classic low-grade oligodendroglial features at first resection (A), as well as 8 years (smear) (B) and 14 years (C) after. Ki67-labeling index in the most current resection remains low (D).
