neoplasm
• retinal and brain tumors develop during embryonic and early postnatal stages
• tumors are poorly differentiated with a variable degree of anaplasia
• Homer Wright rosettes are observed in both the retinal and brain tumors
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• varying incidence of retinal tumors
• most retinal tumors are poorly differentiated, although some are more differentiated and disclose peculiar rosettes composed of a single layer of cuboidal cells centered around a small capillary lined by a single layer of flat endothelial cells
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• varying incidence of brain tumors
• cerebral tumors involve mostly the diencephalon but also extend to the midbrain and fourth ventricle
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vision/eye
• varying incidence of retinal tumors
• most retinal tumors are poorly differentiated, although some are more differentiated and disclose peculiar rosettes composed of a single layer of cuboidal cells centered around a small capillary lined by a single layer of flat endothelial cells
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• ocular tumors lead to total retinal detachment
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nervous system
• varying incidence of brain tumors
• cerebral tumors involve mostly the diencephalon but also extend to the midbrain and fourth ventricle
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