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(a and b) Pre-op axial MRI. Imaging reveals a lesion involving the right superior frontal gyrus posteriorly and partially distorting normal right-brain anatomy. On the opposite side, the Omega shape is highlighted in white. (c) Post-op axial MRI. Imaging demonstrates appropriate excision. Histologically, a grade II astrocytoma was found. (d) Follow-up. No motor deficits seen at neurological examination
