[Cerebral astroblastoma: report of a case and literature review]. / Astroblastoma cerebral: a propósito de un caso y revisión de la literatura.

We report a new case of low grade astroblastoma of pure type and consider the definition and the clinical, neuroimaging, intraoperative and pathological characteristics of this type of uncommon intracranial tumour. We analyse the differences found in the literature concerning the immunochemistry, genetics and electron microscopy. We point out the lack of protocols for treatment of this type of intracranial tumour, and comment the various hypothesis of its origin.

[Spontaneous syncope as the only sign of Arnold-Chiari type I malformations]. / Síncope espontáneo como único síntoma de la malformación de Arnold-Chiari tipo I. Base fisiopatológica.

We present a patient suffering from spontaneous recurrent syncopes as the sole symptom of Arnold-Chiari type I malformation. The syncopes were attributed to transient compression of neural and/or vascular structures at the cranio-cervical junction by the descended cerebellar tonsils, triggered by an increase in intracranial pressure. The disappearance of symptoms after posterior fossa decompression confirmed our hypothesis.