RESUMO
Functional magnetic resonance (MR) imaging of the brain was performed during motor task activation in five normal subjects and a patient with meningioma using conventional fast low-angle shot sequences and a 2.0 T system. A high intensity area in the motor cortex was observed in all normal subjects. Single-slice studies showed the right-sided finger task produced an increase of 1.9-23.5% (6.67 +/- 4.36%) in the signal intensity of the left motor cortex, while the left-sided finger task increased the signal by 1.5-18.2% (6.09 +/- 3.34%) in the right motor cortex. There was no significant difference between the sides. Multiple-slice studies also showed the activated motor cortex as a high intensity area. The maximum signal intensity increase in the activated motor area was 11.0% for the left motor cortex and 8.8% for the right motor cortex. There was no significant difference between the sides. Preoperative mapping of the patient with meningioma showed that the motor cortex was displaced posteriorly by the tumor. Functional MR imaging is possible with a standard MR imaging system and conventional gradient echo sequences. Useful clinical information can be obtained by preoperative mapping of the motor cortex.
Assuntos
Mapeamento Encefálico/métodos , Dominância Cerebral/fisiologia , Imageamento por Ressonância Magnética/métodos , Neoplasias Meníngeas/fisiopatologia , Meningioma/fisiopatologia , Atividade Motora/fisiologia , Córtex Motor/fisiopatologia , Vias Aferentes/fisiopatologia , Nível de Alerta/fisiologia , Lateralidade Funcional/fisiologia , Hemoglobinas/metabolismo , Humanos , Neoplasias Meníngeas/diagnóstico , Meningioma/diagnóstico , Valores de ReferênciaRESUMO
The authors report a case of sparganosis mansoni cerebri. This 33-year-old man had experienced adversive seizures. Plain CT demonstrated a high density area with surrounding low density area, and homogeneously enhanced with contrast medium in the frontoparietal region. 99TcO4 brain scintigram showed an abnormal hot area. On operating as a cerebral tumor, we had removed a living Sparganum mansoni from the cerebral granuloma. This is the third report in the world to our knowledge of literature, in which alive intracranial Sparaganum mansoni was removed. Sparganosis mansoni cerebri is very rare, and therefore it is very difficult to diagnose exactly before operation. However we should remember this disease considering the life history of the patient with convulsion.
