<unk>  is a rare, primitive, fast-growing brain tumor that usually originates from cells of the embryonic medullary cavity. On the other hand, tumors originating in the ciliary body of the eye are referred to as embryonal<unk> s or diktyomas.<unk>  was first discovered by  Bailey and Cushing in 1926. The pathogenesis of<unk>  is characterized by highly malignant undifferentiated primitive neuroepithelial tumor. It most commonly manifests in the cerebral hemispheres, brainstem, cerebellum, and in peripheral sites.<unk>  arises from primitive medullary epithelium, which is normally involved in the embryonic formation of CNS.<unk>  commonly affects individuals younger than 10 years of age. CT scan findings of<unk> , include an isodense or hypodense lesion with variable heterogeneity and calcification. Complete surgical resection is the mainstay of treatment for<unk> . Adjuvant radiochemotherapy is often indicated.
Medulloepithelioma
Lymphoepithelioma
Epithelioma
Pyogenic granuloma
Trichoepithelioma
Angiokeratoma
Littoral cell angioma
Sebaceoma