1p/19q chromosome deletions in metastatic oligodendroglioma.

Extracranial metastasis of primary brain tumors is a rare phenomenon. Of the few cases reported of metastatic oligodendroglioma, only two have evaluated genetic alterations, specifically deletions of chromosomes 1p and 19q. Herein, we report two additional patients with metastatic anaplastic oligodendroglioma to bone, both followed until death. All available pathology specimens were reviewed and genetic analysis was performed in one of the cases. Although the bone metastasis was non-informative, the primary intracranial tumor revealed codeletions of the 1p and 19q chromosomal arms, commonly recognized as the genetically favorable profile of oligodendrogliomas. Both patients died of complications related to their systemic disease and did not have any radiologic evidence of intracranial progression at the time of their last MRI studies. Along with the reported literature, our data suggest that despite their generally favorable behavioral profiles, oligodendroglial tumors with 1p/19q deletions may be more prone to metastasis as they progress. Genetic analysis serves a valuable ancillary role in the diagnostic workup of such cases.