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Background: Stereotactic radiotherapy is a non-invasive procedure in which doses of radiation are administered to cerebral lesions in an ablative attempt. Magnetic resonance plays an important role in evaluating therapeutic response and complications. Objective: The objective of this study is to analyze brain metastases by magnetic resonance, evaluating the changes that occur following treatment with stereotactic radiotherapy to determine whether image characteristics are related to the treatment success rate. Material and methods: A study of cases and controls in 20 metastases was conducted, of patients subjected to stereotactic radiotherapy, who had baseline magnetic resonance and post-treatment control. The variables analyzed were: volume of lesion, detection of lesion, perilesional edema, and mass effect. Results: no magnetic resonance image characteristics were observed that could be associated with a poor response to treatment; however, metastases originating in a melanoma were associated with poor response to treatment. Size larger than 1 cm³ was associated with good response to treatment, and the origin of metastases in primary tumors of the lung. Conclusions: Among the lesions analyzed only the size larger than 1 cm³ as a variable assessed by image was associated with a good response to treatment, and with the pulmonary origin of metastasis. Melanoma as the origin of metastasis was associated with poor response to treatment. Due to the limited number of patients, these results should be considered preliminary. [ABSTRACT FROM AUTHOR]

Introduction. There are tools to quantitatively study the volume of the hippocampus. Such study would help to complement, more objectively and precisely, structural alterations that may be associated with the data obtained from electroencephalograms. Material and methods. Seventeen patients, between 3 and 11 years of age, with diagnosis of first-time seizures and from whom magnetic resonance studies and electroencephalograms were available, were analyzed. Results:.The left temporal lobe was involved in 3 patients, of whom 1 (5%) was found to be normal in the magnetic resonance and 2 (11%) abnormal with diagnoses of venous angioma and cortical atrophy. No significant difference was found between the two groups for the results obtained with resonance (Student p value: 0.6) and those obtained with electroencephalography (Student p value: 0.3). Electroencephalographic alterations in the frontal region were observed in 8 (47%) patients, 4 (23%) predominantly left, 1 (5%) right, and 3 (17%) bilateral; of those, in 5 (29%) cases the resonance was normal, one had left temporal atrophy, one diagnosis of meningitis, and one more of medulloblastoma. Discussion. In the remaining 3 (17%) patients we found generalized cortical involvement in the electroencephalogram, but resonance found one normal study, one suprasellar ependymoma, and one patient with agenesis of the corpus callosum. Conclusion. it was not possible to show a statistically significant value that could relate the results obtained by magnetic resonance with those obtained by electroencephalography. [ABSTRACT FROM AUTHOR]