NI-33 THIRD VENTRICULAR GLIOBLASTOMA MULTIFORME: CASE REPORT AND LITERATURE REVIEW

BACKGROUND: Glioblastoma multiforme (GBM) typically presents in the supratentorial white matter, commonly within the centrum semiovale as a ring-enhancing lesion with areas of necrosis. An atypical presentation of this lesion, both anatomically as well as radiographically is significant and must be part of the differential for a neoplasm in this location. CASE DESCRIPTION: We present a case of a sixty-two year old female with headaches, increasing somnolence and cognitive decline for several weeks. The MRI showed mild left ventricular dilatation with a well-marginated, homogenous, and non-hemorrhagic lesion located at the ceiling of the third ventricle within the junction of the septum pellucidum (SP) and fornix, without exhibiting the typical radiographic features of hemorrhage or necrosis. Final pathology reports confirmed the diagnosis of GBM. CONCLUSION: This case report describes an unusual location for the most common primary brain neoplasm. Moreover, this case identifies the origin of a GBM related to the paracentral ventricular structures infiltrating the body of the fornix and leaves of the septum pellucidum. To our knowledge this is report is the first reported case of a GBM found in this anatomical location with an entirely atypical radiographic presentation.