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Diktyoma
Diktyoma, or ciliary body medulloepithelioma, or teratoneuroma, is a rare tumor arising from primitive medullary epithelium in the ciliary body of the eye. Almost all diktyomas arise in the ciliary body, although, rarely, they may arise from the optic nerve head or retina.〔BroughtonWL, Zimmerman LE. A clinicopathologic study of 56 cases of intraocular medulloepitheliomas. Am J Ophthalmol 1978; 85(3): 407–418.〕
The name "diktyoma" comes from its characteristic findings on histology.
==Classification==
Diktyoma is classified into teratoid and nonteratoid types, based on heteroplastic tissue in the former. Each type may be sub-classified as benign or malignant based on histology.〔Chung EM, Specht CS, Schroeder JW. From the archives of the AFIP: Pediatric orbit tumors and tumorlike lesions: neuroepithelial lesions of the ocular globe and optic nerve. Radiographics. 2007 Jul-Aug;27(4):1159-86.〕
Based on histology, the tumor is classified as malignant if it contains poorly differentiated neuroblasts, nuclear pleomorphism, markedly abnormal mitotic activity, sarcomatous components, or invasion into the uvea, cornea, or sclera.〔 Most diktyomas are malignant.〔〔ShieldsJA, Eagle RC Jr, Shields CL, Potter PD. Congenital neoplasms of the nonpigmented ciliary epithelium (medulloepithelioma). Ophthalmology 1996; 103(12): 1998–2006.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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