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A case of suspected lysosomal storage disease in a neonatal Japanese black calf.

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1
Department of Safety Research, National Institute of Animal Health, Tsukuba, Japan. mikami@affrc.go.jp

Abstract

A 5-day-old Japanese black calf was necropsied and intracytoplasmic vacuolations were histologically observed in many tissues. In the central nervous system, intracytoplasmic inclusions and vacuoles were found in neuronal cells. Intracytoplasmic inclusions were more conspicuous in the nuclei containing large nerve cells, especially in the brain stem and spinal cord. These inclusions were stained weak positive to positive with alcian blue, Giemsa, Luxol fast blue and periodic acid-Schiff stains but not with oil red O. Ultrastructurally, neuronal inclusions were observed in lysosomes and consisted of an amorphous electron-dense substance and occasional membranous structures. These findings seem to differ from the cases of bovine lysosomal diseases that have been reported, and this case may be another type of lysosomal storage disease.

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