<unk>  is a rare, primitive, fast-growing brain tumour thought to stem from cells of the embryonic medullary cavity. Tumours originating in the ciliary body of the eye are referred to as embryonal<unk> s, or diktyomas. A highly malignant undifferentiated primitive neuroepithelial tumour of children,<unk>  may contain bone, cartilage, skeletal muscle, and tends to metastasize extracranially.
Medulloepithelioma
Lymphoepithelioma
Epithelioma
Pyogenic granuloma
Trichoepithelioma
Desmoplastic trichoepithelioma
Angiokeratoma
Nesidioblastoma