Desarrollo de un linfoma cerebral con relación a un quiste epidermoide de larga evolución / Brain lymphoma development related to a long lasting epidermoid cyst

Introducción: Los quistes epidermoides (QE) son lesiones de lento crecimiento y naturaleza benigna. Se presenta un caso de un desarrollo de un linfoma cerebral (LC) con relación a un tumor epidermoide, segundo caso descrito en la literatura. Presentación del caso: Mujer de 40 años con QE intracraneal de larga evolución que desarrolla una lesión intraaxial rápidamente progresiva de acuerdo con dicho tumor. Tras la resección el diagnóstico es de linfoma primario difuso de células B. Discusión: La transformación de QE a carcinomas de células escamosas ha sido reportado en contadas ocasiones, siendo el desarrollo de otras lesiones malignas conforme este proceso, absolutamente excepcional. Se han invocado mecanismos inflamatorios como la causa de dicha transformación. En la génesis de los linfomas están involucrados estos mecanismos y en el caso que nos ocupa, podría haber jugado un papel en el desarrollo del tumor. Conclusiones: Aún siendo lesiones benignas, los QE tienen cierto potencial de malignización secundario a mecanismos de inflamación crónica (AU)

Introduction: Epidermoid cysts (EC) are benign and slow growing lesions. A primary brain lymphoma development related to a EC is presented, second case described in literature. Case presentation: A woman 40 years old, harbouring a EC for more than 20 years, develops a fast growing brain lesion next to the EC. Surgery was performed and diagnosis was primary diffuse B cells lymphoma. Discussion: Malignant transformation of EC has been described, usually to squamous cells carcinoma, and much less frequently, to another tumours. Inflammatory mechanisms have been advocated to explain this evolution. Chronic inflammation and lymphoma genesis are related, and this could be the mechanism behind this rare evolution of an EC. Conclusions: Even being benign lesions, EC can develop malignant tumours due to the chronic inflammation secondary to them (AU)

Outcome of radiosurgery treatment with a linear accelerator in patients with trigeminal neuralgia. / Resultados de la aplicación de radiocirugía con acelerador lineal en pacientes con neuralgia del trigémino.

INTRODUCTION: An overview of the effectiveness of radiosurgery in patients diagnosed with trigeminal neuralgia with an analysis of potential predictors of good outcome. METHODS: All patients treated with linear accelerator radiosurgery between 2004 and 2011 were analysed. A dose of 60Gy dose was administered 1 to 2mm from the root entry zone with a maximum isodose of 20% delivered to the brainstem. Clinical results for pain control and any side effects were analysed at 12 and 36 months (BNI score). RESULTS: The study included 71 patients (mean follow-up 50.5 months). Pain improvement at 12 months was observed in 68.11% of the total (28.98% with BNI score i-ii; 39.12% with BNI score iii) and at 36 months in 58.21% (23.88% BNI score i-ii; 34.32% BNI score iii). Average recovery time was 3.69 months and the relapse rate was 44.68%. Patients with typical pain displayed statistically significant differences in improvement rates at 12 and at 36 months (P<047 and P<.002). Onset of improvement was analysed using Kaplan-Meyer plots. Statistically significant differences were observed between patients with typical and atypical pain at 36 months (P<.012) in Kaplan-Meyer plots. Side effects were recorded in 15 patients (20.89%), including 9 cases of facial numbness (13.43%); only 2 cases were clinically relevant (2.98%). CONCLUSION: According to our results, radiosurgery is an effective treatment for trigeminal neuralgia, with few side effects. Typical pain seems to be a good predictor of pain relief.