RESUMO
OBJECTIVE: Clear cell meningiomas (CCM) are an uncommon meningioma subtype marked by aggressive growth and high rates of recurrence despite initial resection. The present study evaluates the adjuvant benefit of stereotactic radiosurgery (SRS) for residual or recurrent tumors. METHODS: After review of our prospectively maintained database, we identified 6 patients (3 female) with histologically confirmed Grade 2 CCMs. The median age of the patients at the time of SRS was 45 years. Five patients had undergone prior gross total surgical resection and 1 patient had subtotal resection before SRS. The median SRS treatment volume was 4.7 cc and the median radiosurgical margin dose was 13 Gy (range: 10-15 Gy). RESULTS: The median follow-up time was 35.5 months (range 6-168 months). Three patients achieved tumor control after the first SRS procedure. Three patients experienced tumor progression at 4, 22, and 32 months after initial SRS. Tumor control was obtained in 2 of these patients after additional SRS. One patient with multiple SRS procedures had suspected adverse radiation effect that was successfully treated with corticosteroids followed by bevacizumab. CONCLUSIONS: Tumor control was maintained in 5 of 6 patients after one or more SRS procedures. SRS should be considered for early intervention after surgical resection of CCM. To maximize the tumor control rate, patients with diagnosed CCM should be treated more generously and higher margin dose should be prescribed. Patients with CCM should be counselled that more than one SRS may be necessary to provide sustained tumor control.
Assuntos
Neoplasias Meníngeas , Meningioma , Radiocirurgia , Humanos , Feminino , Pessoa de Meia-Idade , Meningioma/radioterapia , Meningioma/cirurgia , Meningioma/etiologia , Radiocirurgia/métodos , Resultado do Tratamento , Recidiva Local de Neoplasia/cirurgia , Recidiva Local de Neoplasia/etiologia , Neoplasias Meníngeas/radioterapia , Neoplasias Meníngeas/cirurgia , Neoplasias Meníngeas/etiologia , Estudos Retrospectivos , SeguimentosRESUMO
Os meningeomas são neoplasias derivadas das células aracnóideas, sendo sua origem ligada a alterações genéticas idiopáticas (deleção do braço longo do cromossomo 22), doenças predisponentes à sua formação e indução por radioterapia. Relata-se o caso de um homem de 50 anos com meningeoma pós-radioterapia diagnosticado 20 anos após o tratamento de um oligodendroglioma. Os critérios que suportam o diagnóstico de meningeoma induzido por radioterapia são discutidos, assim como é revisada a literatura pertinente ao assunto.
Meningiomas are neoplasms derived from arachnoid cells with their origin linked to idiopathic genetic abnormalities (delection of the long arm of chromosome 22), predisposing diseases and radiotherapy induction. We report the case of a 50 years-old man radiation-induced meningioma 20 years after the diagnosis, surgical and radiation treatment of an oligodendroglioma. The supporting diagnostic criteria of radiation-induced meningiomas are discussed and the pertinent literature of the theme is revised.
Assuntos
Humanos , Masculino , Pessoa de Meia-Idade , Irradiação Craniana/efeitos adversos , Neoplasias Meníngeas/etiologia , Meningioma/etiologia , Neoplasias Induzidas por Radiação , Imageamento por Ressonância Magnética , Neoplasias Meníngeas/diagnóstico , Neoplasias Meníngeas/cirurgia , Meningioma/diagnóstico , Meningioma/cirurgia , Neoplasias Induzidas por Radiação/diagnóstico , Neoplasias Induzidas por Radiação/cirurgia , Oligodendroglioma/radioterapia , Prognóstico , Tomografia Computadorizada por Raios XRESUMO
Se presenta el caso de un paciente del sexo masculino de 2 años de edad, que cursó con retinoblastoma bilateral. El O.D. fue enucleado con persistencia de actividad neoplásica en el borde de sección quirúrgica, lo que propició carcinamatosis meníngea, diseminación al sistema ventricular, invasión al diencéfalo, corteza cerebral y cerebelosa. Se presentan los hallazgos de autopsia y la correlación clínico*patológica