A 69?year?old male was brought by the family to theemergency department with a 10?month history of morningheadaches, loss of smell bilaterally, memory loss, personalitychanges, and urinary incontinence. Blood investigationswere normal. Magnetic resonance imaging (MRI) revealed5.0 cm × 5.2 cm × 5.0 cm (AP × ML × CC) T1isointense extra?axial lesion in the anterior cranial fossashowing diffusion restriction [Figure 1] and vivid contrastenhancement [Figures 2?4] arising from the olfactory groove with involvement of the nasal cavity and ethmoidal sinuses.A significant mass effect with cortical buckling and lateraldisplacement of the medial aspects of the frontal lobes withposterior displacement of the genu of the corpus callosumwas noted. The frontal horns of the lateral ventricles weresplayed by the mass. Computed tomography revealedwhite matter hypodensity in the frontal lobes representingvasogenic edema [Figure 5]. Imaging features were resection of tumor invading the cranial base is associatedwith the recurrence rate. The recurrence rate of OGMsranges from 5% to 41%.
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