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NEUROLOGY 1998;51:565-569
© 1998 American Academy of Neurology

Mucolipidosis type IV

Characteristic MRI findings

K. P. Frei, MD, N. J. Patronas, MD, K. E. Crutchfield, MD, G. Altarescu, MD and R. Schiffmann, MD

From the Developmental and Metabolic Neurology Branch (Drs. Frei, Crutchfield, Altarescu, and Schiffmann), National Institute of Neurologic Disorders and Stroke; and the Diagnostic Radiology Department (Dr. Patronas), Warren Grant Magnuson Clinical Center, National Institutes of Health, Bethesda, MD.

Address correspondence and reprint requests to Dr. Raphael Schiffmann, National Institutes of Health, Building 10, Room 3D03, 10 Center Drive, MSC 1260, Bethesda, MD 20892-1260.

Objective: The objective of this study is to characterize the brain abnormalities on head MRI of patients with mucolipidosis type IV.

Background: Mucolipidosis type IV is an autosomal recessive lysosomal storage disease of unknown etiology. Patients develop corneal clouding, retinal degeneration, spastic quadriparesis, and mental retardation. Patients with this disorder have not been studied systematically.

Methods: We studied prospectively 15 consecutive patients with mucolipidosis type IV using cranial MRI.

Results: Fourteen patients with these typical clinical findings had a hypoplastic corpus callosum with absent rostrum and a dysplastic or absent splenium, signal abnormalities on T1-weighted head MRI images in the white matter, and increased ferritin deposition in the thalamus and basal ganglia. Atrophy of the cerebellum and cerebrum was observed in older patients, which may reflect disease progression. One patient with a mild clinical variant had a normal corpus callosum.

Conclusion: Patients with mucolipidosis type IV have characteristic cranial MRI findings that suggest that this disorder causes both developmental and neurodegenerative abnormalities.

Received February 4, 1998. Accepted in final form April 3, 1998.




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