The following images of spiral tomography (TEM) brain correspond to patients who have been treated at the National Institute of Neurological Sciences. The final diagnosis was verified in their clinical and / or by pathological diagnosis stories.

La persistencia de la arteria trigeminal es una alteración vascular infrecuente y representa la permanencia, después del nacimiento, de la comunicación entre el sistema carotideo y el sistema vertebro-basilar. Esta persistencia se ha asociado a la existencia de otras alteraciones de la morfología vascular cerebral y a condiciones clínicas variadas. Reportamos tres casos de persistencia de la arteria trigeminal, dos como hallazgo incidental en pacientes con sintomatología transitoria y uno en un cuadro de hemorragia subaracnoidea, identificados mediante reconstrucción tridimensional de imágenes obtenidas por angiotomografía.

Low-grade fibromyxoid sarcoma (LGFMS) is a soft tissue tumor of mesenchymal origin. Sarcomas are a heterogeneous group, representing 1% of all neoplasm diagnoses. Primary sarcomas of the central nervous system (CNS) are rare, and represent only 0.7% of all sarcomas, with an estimated incidence of 3 per 10 million people per year. The case of a 59-year-old woman who developed a low-grade intracranial fibromyxoid sarcoma in the right parietal region, is described. The clinical course, imaging studies, histopathological features, and treatment approach of this unusual diagnosis, are discussed. Low-grade intracranial fibromyxoid sarcoma is a rare and probably under- reported condition. The definitive diagnosis is usually made through histo-pathological studies.