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Bilateral optic nerve aplasia associated with hydranencephaly.
Annals of Ophthalmology
|October 1, 1984
Summary
Bilateral optic nerve aplasia (ONA) is a rare condition diagnosed clinically, often linked to severe congenital anomalies and potentially autosomal recessive inheritance in consanguineous families. This condition results from a failure in retinal ganglion cell development.
Area of Science:
- Ophthalmology
- Neuroscience
- Genetics
Background:
- Optic nerve aplasia (ONA) is a rare congenital condition characterized by the absence of the optic nerve.
- Bilateral ONA is particularly rare and often associated with significant central nervous system (CNS) anomalies and other congenital malformations.
Observation:
- This report details a case of bilateral ONA in an infant presenting with hydranencephaly and multiple congenital anomalies.
- The infant was born to a consanguineous union, suggesting a possible autosomal recessive inheritance pattern.
Findings:
- Bilateral ONA is hypothesized to result from a failure in the development of retinal ganglion cells.
- This developmental failure leads to the absence of the optic disc, optic nerve, and retinal blood vessels.
- The condition appears to be a distinct clinical entity, separate from unilateral ONA.
Implications:
- Bilateral ONA is strongly associated with major CNS anomalies and other severe congenital malformations.
- Accurate clinical diagnosis is possible, aiding in the management and genetic counseling of affected families.
- Understanding the pathogenesis, possibly linked to autosomal recessive transmission, is crucial for genetic counseling in consanguineous populations.