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This is a surgical technique video of selective posterior callosotomy (SPC), a novel surgical procedure to alleviate refractory epileptic drop attacks.1 Departing from traditional approaches aiming the anterior half or the entire callosum, SPC sections the posterior half of the callosum sparing prefrontal connectivity.1 Drop attacks are generalized epileptic seizures characterized by sudden falls.1 These seizures are often seen in diffuse brain pathology associated with generalized or multifocal epilepsies, whose electroencephalogram (EEG) “fingerprint” is bilaterally synchronous epileptic discharges.1 Sectioning the callosum to control drop attacks follows the rationale that the rapid synchronization of discharges between motor and premotor regions of both hemispheres is the basis.1 The standard approach to callosotomies always contemplated the anterior fibers of the callosum.2 Literature reports that anterior sections lead to unsatisfactory control of drop attacks, and results are improved when extended into a total callosotomy.2,3 This evidence coupled with diffusion tensor imaging (DTI) findings showing that motor and premotor fibers actually cross through posterior half of the callosum led us to hypothesize that selective section of the posterior half of the callosum would section all relevant motor fibers and control drop attacks to a similar extent to total callosotomies, with the advantage of sparing prefrontal interconnectivity3 and no split-brain syndrome. Both our series, one retrospective, followed by a new prospective study have confirmed SPC to be a safe procedure, leading to complete or greater than 90% control of epileptic falls in 85% of patients.1 The video presented here was recorded during a selective posterior callosotomy performed on a 13-yr-old girl who had hundreds of uncontrollable drop attacks per day. Falls were completely controlled with significant gains in psychomotor development and cognition, after 5 yr of follow-up. The patient provided signed consent to the surgical procedure, video acquisition, photo acquisition, and storage at operations, and the publication of this material.

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ResumoMeningiomas pediátricos são raros, representando apenas 2,2% dos tumores do sistema nervoso central (SNC). Em tal faixa etária, localizam-se com maior frequência em sítios atípicos, como, principalmente, o sistema ventricular -com frequência de 8,8 a 13,6%. Em vista disso, e de que o subtipo angiomatoso constitui apenas 2,1% de todos meningiomas, corrobora-se a raridade do caso aqui relatado: paciente feminina de 17 anos diagnosticada com meningioma angiomatoso intraventricular. Foi submetida à ressecção cirúrgica de tumor em corpo e corno frontal do ventrículo lateral direito, não havendo sequela neurológica. Com acompanhamento de 26 meses não apresentou recidiva e demonstra estabilidade clínica. Tumores intraventriculares geralmente possuem crescimento lento e atingem tamanho considerável até ocasionarem sintomas e serem, então, diagnosticados. Somado a isso, a localização profunda do tumor e a proximidade com áreas eloquentes tornam tais tumores um evidente desafio neurocirúrgico. O subtipo angiomatoso, por apresentar hipervascularização (é constituído por mais de 50% de componentes vasculares), pode tanto dificultar, em alguns casos, a ressecção cirúrgica quanto ser erroneamente diagnosticado. Porém, o tratamento cirúrgico visando à ressecção da lesão mantém-se como a conduta de escolha no caso aqui relatado, especialmente, em pacientes nas duas primeiras décadas de vida, nos quais se evita o uso de radiação. Especificamente em relação à cirurgia, optou-se por uma abordagem transcalosa que possibilita uma boa visualização transoperatória da lesão quando localizada em corpo e corno frontal do ventrículo lateral. AbstractPediatric meningiomas are rare and account for only 2.2% of CNS tumors. In this age group, they are more frequently located in atypical sites, such as, mainly, the ventricular system, with a frequency of 8.8 to 13.6%. Adding this to the fact that the angiomatous subtype constitutes only 2.1% of all meningiomas, the rarity of the case reported here is corroborated. We report a 17-year-old female patient diagnosed with intraventricular angiomatous meningioma; she underwent surgical resection of