-We re p o rt two patients with central neurocytomas at an uncommon location in the brain. The first, a 58-year-old man presenting with signs and symptoms of increased intracranial pre s s u re, had a tumor located at the pineal region. The second, a 21-year-old woman with tumor in the aqueductal region had worsening migraine-like headaches and diplopia. Both patients had obstructive hydrocephalus treated by n e u roendoscopic third ventriculostomy and biopsy of the tumors. No additional treatment was done. We conclude that neurocytomas should be considered in the diff e rential diagnosis of tumors located in the pineal and aqueductal regions.KEY WORDS: central neurocytoma, aqueductal region, pineal region, third ventriculostomy. Localizações incomuns do neurocitoma central: relato de dois casosRESUMO -Relatamos dois pacientes com neurocitoma central com localização incomum no sistema nervoso central. O primeiro, 58 anos, masculino, apresentava sinais e sintomas de hipertensão intracraniana, tinha um tumor na região da pineal. O segundo, feminino, 21 anos, tinha um tumor na região do aqueduto de Sylvius e apresentava cefaléia migranosa pro g ressiva e diplopia. Ambos apresentavam hidro c efalia obstrutiva tratada com terceiroventriculostomia endoscópica e biópsia da lesão. Não foi feito tratamento adicional. Concluimos que os neurocitomas devem ser considerados no diagnóstico diferencial de tumores localizados na região da pineal e do aqueduto. We re p o rt two patients with central neuro c y t o m a s at uncommon locations in the brain. In one patient the tumor was located in the aqueductal region and in the other the tumor laid in the pineal region. PALAVRAS-CHAVE CASESCase 1 -A 58-year-old man presented with a one-year h i s t o ry of memory loss, gait disturbance and headache. N e u rologic examination showed ataxic gait and papilledema. Computerized tomography images showed a hyperdense mass at the pineal region, with small points of calcification and moderate enhancement after contrast agent. Neither cysts nor invasion of the ventricular walls were seen. Lateral and third ventricles were dilated and showed periventricular edema, characterizing obstructive hydro c e p h alus. FLAIR and post-gadolinium T1-weighted MR images (Fig 1) revealed a mass with heterogeneous signal and moderate enhancement after paramagnetic agent, without
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