<prompt> Calcification is seen in all of the following except:Persistent hyperplastic primary vitreousRetinoblastomaChoroidal osteomaOptic nerve head drusen  <response>: All of the following have characteristic calcification as a sign of identification except persistent hyperplastic primary vitreous. Ocular Structures that can have Calcification Concretions In conjunctiva Optic nerve head drusen Retinoblastoma Choroidal Osteoma Pthisical eyeball Band shaped keratopathy 