Retinal dysplasia.

Retinal dysplasia is defined as an abnormal growth and differentiation of embryonic retina being more a secondary lesion rather than a disease. Clinically, the disorder may present itself in a surprisingly wide range of severity or of degree from retinal folds to vascularized masses in the vitreous cavity. The condition may appear monosymptomatically, involving only the eye, or as complex disorders with multisystemic anomalies. The histopathologic findings in this disorder recognize characteristic structural deviations of the retina and the pathogenesis seems to be related to the lack of the normal histogenesis of the pigment epithelium. Impaired genetic mechanisms seem to contribute to the etiology of some forms of retinal dysplasia.