title: Medulloepithelioma arising from the posterior pole.
abstract: In the right eye of a 2 1/2-year-old boy a markedly prominent tumor, arising from the posterior pole, was found. The clinical diagnosis was retinoblastoma and the eye was removed. Histologically, however, this appeared to be a medulloepithelioma originating in the optic disc and in the posterior retina: an extremely rare localization as these tumors usually originate in the ciliary region. The tumor mainly consisted of neuroectodermal elements in several degrees of differentiation giving the aspect of a benign (hamartomatous) embryonal brain tumor rather than those of a retinal tumor. Some aspects of the nomenclature are discussed.
mesh_terms: D002675:Child, Preschool; D003937:Diagnosis, Differential; D005134:Eye Neoplasms / Q000473:pathology*; D006801:Humans; D008297:Male; D018241:Neuroectodermal Tumors, Primitive, Peripheral / Q000473:pathology*; D009898:Optic Disk / Q000473:pathology; D009626:Terminology as Topic