ABSTRACT
OBJECTIVE: The aim of this study is to investigate a source of cortical magnetic fields evoked by index finger movements. METHODS: We analysed both movement-related cortical fields (MRCFs) and somatosensory-evoked fields (SEFs) by single equivalent current dipole (ECD) method in six healthy subjects. Dipole locations were superimposed on MR images of each individual subject. RESULTS: The first component after finger movement (movement-evoked field I, MEFI) was observed in all subjects. The dipole of MEFI was oriented posteriorly, and was located on the posterior wall of the central sulcus of the hemisphere contralateral to the movement. The SEFs showed three major components: N20m, P30m and P60m. The dipoles of P30m and P60m were orientated posteriorly, similarly to the MEFI dipole, while that of N20m was orientated anteriorly. The dipole location of MEFI was closely located to P60m, not to N20m and P30m. The mean location of the MEFI dipole was significantly (p<0.05) superior to N20m. CONCLUSION: These findings suggest that MEFI would be generated in the sensory area (area 3b) affected by multiple afferents and activities, and that the source of the MEFI is not identical to that of the N20m component.
Subject(s)
Brain Mapping , Cerebral Cortex/physiology , Evoked Potentials, Somatosensory/physiology , Fingers/innervation , Movement/physiology , Adult , Cerebral Cortex/anatomy & histology , Electric Stimulation/methods , Electroencephalography/methods , Female , Humans , Magnetic Resonance Imaging , Magnetoencephalography , Male , Reaction Time/physiologyABSTRACT
A 25-year-old male presented with an intracranial tuberculoma mimicking falx meningioma manifesting as right lower monoparesis. The patient had a past history of pulmonary tuberculosis, cured by antituberculous therapy. Computed tomography and magnetic resonance (MR) imaging showed a lesion mimicking a falx meningioma. Surgery achieved subtotal resection. Histological and biochemical examinations revealed the surgical specimen was tuberculoma. He was treated with antituberculous therapy, and his gait disturbance disappeared. Follow-up MR imaging showed no regrowth.
Subject(s)
Meningeal Neoplasms/pathology , Meningioma/pathology , Tuberculoma/pathology , Adult , Diagnosis, Differential , Humans , Magnetic Resonance Imaging , Male , Meningeal Neoplasms/surgery , Meningioma/surgery , Tuberculoma/surgerySubject(s)
Brain Abscess/microbiology , Brain Abscess/pathology , Cerebral Hemorrhage/complications , Cerebral Hemorrhage/pathology , Enterococcus faecalis/pathogenicity , Gram-Positive Bacterial Infections/etiology , Brain Abscess/diagnostic imaging , Causality , Cerebral Hemorrhage/diagnostic imaging , Clinical Protocols , Diabetes Complications , Enterococcus faecalis/drug effects , Fever/complications , Fever/microbiology , Gram-Positive Bacterial Infections/drug therapy , Humans , Hypertension/complications , Magnetic Resonance Imaging , Male , Middle Aged , Penicillins/therapeutic use , Putamen/diagnostic imaging , Putamen/microbiology , Putamen/pathology , Tomography, X-Ray ComputedABSTRACT
The first case of a ventrally exophytic pontine glioma with extensive and dense calcification is reported. A 10-year-old boy presented with a generalized seizure. The skull radiogram and CT scan showed a dense area of calcification, revealed by MRI as the core of a ventrally exophytic tumor. The pathologic diagnosis was fibrillary astrocytoma.
