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Olivary hypertrophy

Histochemical demonstration of hydrolytic enzymes

Neurology Service, VA Medical Center, and the Department of Neurology, Albany Medical College, Albany, NY.

of four patients with palatal myoclonus, three had infarcts resulting from atherosclerosis, and one had cerebral emboli from a left atrial myxoma. Three specimens showed lesions in the brainstem and bilateral hypertrophy of the inferior olivary nuclei; the fourth revealed unilateral olivary changes caused by an infarct in the contralateral dentate nucleus.

After incubation for acetylcholinesterase, neuropilar and capillary wall staining were absent or much reduced, but there was increased density of reaction product in the neuronal cell bodies and in numerous tortuous dendrites. Methods for acid phosphatase showed strong activity in the dendrites and glomeruloid structures of the diseased olives. Reactions for nonspecific esterase indicated dendritic expansion and reduced staining density in nerve cell bodies, but augmented glial reactivity.

Address correspondence and reprint requests to Dr. Koeppen, Neurology Service, Veterans Administration Medical Center, Albany, NY 12208.

Supported by the Veterans Administration.

Presented in part at the thirty-first annual meeting of the American Academy of Neurology, Chicago, April 1979.

Accepted for publication August 27, 1979.

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