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Figure 1: (a) Pre-operative magnetic resonance imaging coronal with gadolinium showing a contrast enhancing heterogeneous mass, expanding and distorting the frontal sinuses and extending through the cribriform plate into the nasal cavity. (b) Pre-operative computed tomography (CT) coronal showing the bony changes and breach of the cribriform plate. (c) Photomicrograph of schwannoma illustrating interlacing fascicle of spindle shaped cells (H and E, ×90). (d) Follow-up CT after 12 months showing no tumor

Figure 1: (a) Pre-operative magnetic resonance imaging coronal with gadolinium showing a contrast enhancing heterogeneous mass, expanding and distorting the frontal sinuses and extending through the cribriform plate into the nasal cavity. (b) Pre-operative computed tomography (CT) coronal showing the bony changes and breach of the cribriform plate. (c) Photomicrograph of schwannoma illustrating interlacing fascicle of spindle shaped cells (H and E, ×90). (d)  Follow-up CT after 12 months showing no tumor