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(Science: tumour) A rare, primitive, rapidly growing intracranial neoplasm thought to originate from the cells of the embryonic medullary canal and hence included with ependymoblastomas by some neuropathologists; ganglion cells and astrocyte maturation have also been reported. Tumours that occur in the ciliary body are referred to as embryonal medulloepithelioma's.

Origin: medullo-_ epithelium _ -oma, tumour