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The adequate use of the anomalous chemical-physical characteristics of the water molecule may provide a good mechanism to expand the ventricular cavity, in order to create an experimental model of hydrocephalus. The endoscope may be introduced by the usual ways, allowing anatomical observation and simulation of the same tactile sensitivity that one would find during the actual procedure.

RESUMO PALAVRAS-CHAVEAnormalidades congênitas, meningomielocele, tubo neural. ABSTRACT Association of myelomeningocele and myelocystocele. Case reportWe report a case of dorsal-lumbar myelomeningocele associated with a dorsal myelocistocele in a female newborn. The defects were surgically corrected in the first 24 hours. Revision of the neural tube closure theory was done, to justify the association of these malformation.

Schwannomatosis is a rare tumor syndrome characterized by more than one schwannoma without any evidence of other manifestations of neurofibromatosis (NF). A 32-year-old woman was admitted to our hospital because of weakness in her lower extremities. Neurological examination revealed paraparesis with hypoesthesia below T8 level. Magnetic ressonance imaging (MRI) showed well-defined masses with strong contrast enhancement at the dorsal and lumbosacral spinal regions. After removal of six tumors compressing the spinal cord, the patient improved rapidly. The histological diagnosis was schwannomas. A detailed clinical examination and MRI scanning of the central nervous system excluded NF2. Not all patients with multiple schwannomas of cranial nerves, spinal nerve roots or peripheral nerves origin have NF-1 or NF-2. Surgery is indicated for symptomatic lesions, while asymptomatic tumors are followed conservatively.

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