A review of a family and the most recent case history in the only male has shown that the cerebellar tumdur was verified for sibling I at the age of 29 years by pathological section and an eye tumour was treated by radon seeds. Sibling II-the cerebellar tumour was verified at operation at the age of 23 years and by pathological section at two subsequent operations. The eye tumour presented a similar pathological appearance. Sibling III had a naevus of the limbus of the left eye, which became less apparent after nine years.
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Hartridge et al. (1948) studied this question.