The goal of this electronic poster is to establish the different characteristics by conventional and advanced MRI techniques of oligodendrogliomas and oligoastrocytomas. At the same time, analyze whether they are of statistical value for predicting the histological grade of these neoplasms.

A retrospective study was carried out from a database of patients of the Neurosurgery Departmentat the Hospital Italiano de Buenos Aires (HIBA), as well as with cases provided by the Ethics Committee of Research Protocols (CEPI). We managed to obtain 108 cases of patients with the diagnosis, proven by pathological anatomy studies, of oligodendroglioma or oligoastrocytoma. According to the most recent WHO classification, oligodendrogliomas and oligoastrocytomas can be divided into low grade (WHO grade II) or anaplastic (WHO grade III). Of these, 72 had MRI...

As previously mentioned, the study relied on conventional and advanced MRI techniques. Among the variables conventionally studied by MRI are margins, signal intensity, tumor location, cortical compromise, tumor calcifications and behavior with intravenous contrast (see Table 1). For example, one can see how prevalence exists at the frontal lobe(58%) followed by the location in the temporal lobe (20%). Similar numbers were reported by Koeller et al (4). Information on the existence or non-existence of calcifications was available in 71 patients. They were present in 8...

The current exhibittried to show more than the usualdescriptive characterization of the morphology and anatomy affected in patients with oligodendrogliomas and oligoastrocytomas. Although of great importance in the therapeutic management, nowadays it is known with certainty that the determination of the histological grade and the genetic factor arekey to choose the appropriate and optimal approach in these patients (2). To determine the diagnostic potential of conventional MRI techniques, presence or absence of calcifications and behaviour with intravenous contrast administration were taken into account. The presence...

Radiopaedia (2005-2016). URL: http://radiopaedia.org/articles/oligodendroglioma FellahS,CaudalD,De PaulaAM,et al.Multimodal MR imaging (diffusion, perfusion, and spectroscopy): is it possible to distinguish oligodendroglial tumor grade and 1p/19q codeletion in the pretherapeutic diagnosis?AJNR Am J Neuroradiol2013;34:1326-1333. Engelhard H. et al. Oligodendroglioma and anaplastic oligodendroglioma: Clinical features, treatment and prognosis. Surg Neurol; 60:443-456, 2003. Koeller K. et al. From the Archives of the AFIP. Oligodendroglioma and Its Variants: Radiologic-Pathologic Correlation. Radiographics 2005; 25:1669-1688. Khalid L. et al. Imaging Characteristics of Oligodendrogliomas that Predict Grade. AJNR Am J Neuroradiol 33, May 2012....