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This study explores the relationship between the results of tests of dementia and the EEG findings in 94 demented patients of different etiologies. Abnormal EEGs were found in 83% of all patients, usually diffuse slow wave abnormalities, the degree of which correlated very well with the Modified Hachinski test. Only a weak relationship was found between the EEG and the Mini-Mental Status Examination, while the Mattis and its subtests correlated better. Focal EEG abnormalities on the temporal areas were the characteristic pattern in patients with alcoholic dementia. The test scores in the 17% with normal EEGs were consistent with the above findings, in that patients with normal tracings scored well on the Modified Hachinski and Mattis tests, but not on the Mini-Mental Status Exam.

We describe a patient with peduncular hallucinosis and a mesencephalic infarct; the infarct was diagnosed during life by magnetic resonance imaging.Geller TJ, Bellur SN: Peduncular hallucinosis: magnetic resonance imaging confirmation of mesencephalic infarction during life. Ann Neurol 1987 The occurrence of acute visual hallucinosis does not generally aid in localizing the site of central nervous system dysfunction except in the instance of peduncular hallucinosis. Peduncular hallucinosis is characterized by vivid, nonstereotypical, colorful imagery that is nonthreatening to the patient. The hallucinations occur in the presence of mesencephahc dysfunction. Welldocumented cases are few, and most of these have included autopsy findings. We report a case of peduncular hallucinosis in which the anatomical diagnosis was confirmed during life by magnetic resonance imaging (MW. Case ReportA 61-year-old man with insulin-dependent diabetes mellitus and atherosclerotic cardiovascular disease was admitted to the West Side Veterans' Hospital, Chicago, with a 1-day history of inability to open his right eye and clumsiness and weakness of the left side of his body. During this time his family noticed that he was drowsy and his speech was slurred. They also noted that the patient spoke of visual images that were clearly hallucinatory. When questioned, the patient described seeing images of cats running about the floor, flowery outdoor scenes in bright purple colors, and the faces of neighbors and friends. These images appeared continuously in all areas of the visual fields and lasted for minutes to hours. The patient was aware that the visual images were not real and was not apprehensive about them.