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Recibido el 30 de junio de 2013; aceptado el 16 de agosto de 2013 Disponible en Internet el 16 de mayo de 2014 PALABRAS CLAVEExtranodal; Linfoma de células T-natural killer; Esófago Resumen El linfoma de células T/NK extraganglionar tipo nasal con localización gastrointestinal es raro. Hasta ahora, no se ha reportado en la literatura ningún caso de linfomas T/NK con localización esofágica como el presentado. El curso clínico es agresivo, con sintomatología relacionada con el efecto de masa del tumor. La lesión endoscópica fue una lesión ulcerativa en tercio esofágico interior. El diagnóstico es un reto para este tipo de tumor. AbstractThe T-cell lymphoma, nasal type NK estraganglionar with gastrointestinal location is rare. Until now, not been reported in the literature T-NK/T-cell lymphomas esophageal location, as depicted. The clinical course is aggressive, with symptoms related to mass effect of the tumor. The lesion was ulcerative lesion in endoscopic esophageal third inside. Diagnosis is a challenge for this type of tumor

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Introduction: Extensive resection for malignant intraaxial intracranial tumors has been demonstrated to improve survival. This is not always possible due to potential tumor location in or next to eloquent brain regions, like primary motor cortex or speech areas. In this case, avoiding neurological defi cits is challenging. One of the tools for minimizing that risk is intraoperative cortical mapping (ICM). This report describes the ICM technique of eloquent brain regions, feasibility and complementariness with other methods for tumor localization. Methods: Seven patients with brain lesions near eloquent regions operated on were analyzed. Frameless stereotaxis (neuronavigation) and intraoperative cortical mapping (direct cortical stimulation and monitoring of somatosensory evoked potentials) were used. The location, size, type of lesion, amount of resection, pre and postoperative neurological status were studied. Results: ICM was effective in localizing primary motor cortex in all patients. In 6 patients the tumor area without functionality was removed, achieving complete or greater than 90% resection in 5 of them. In one patient the lesion was a deep arteriovenous malformation located below the primary motor cortex. In this case ICM made feasible an approach from non-eloquent cortex to achieve total resection. No new postoperative defi cit was found in a 12 month follow-up period. Conclusion: ICM is useful and localize functional cortical regions effectively, simply and reliably, making possible to perform extensive tumor resections in eloquent regions. This technique is complementary to other tools for anatomical or physiological localization and could contribute to a safer and more effective surgery.

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