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Persistent pupillary membrane associated with aniridia.

N Hamming, J Wilensky

    American Journal of Ophthalmology
    |July 1, 1978
    PubMed
    Summary
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    Familial aniridia, a genetic disorder, presents with minimal iris remnants. This case suggests a neuroectodermal defect, challenging previous theories on its origin.

    Area of Science:

    • Ophthalmology
    • Developmental Biology
    • Genetics

    Background:

    • Familial aniridia is an autosomal dominant disorder characterized by a severe deficiency of iris tissue.
    • The embryologic origin of aniridia, whether neuroectodermal or mesodermal, remains a subject of debate.
    • Persistent pupillary membranes are vascular remnants that can be associated with various ocular anomalies.

    Observation:

    • A male infant presented with bilateral congenital aniridia and persistent pupillary membranes.
    • The infant exhibited a notable vascular arcade extending 360 degrees onto the anterior lens surface from residual iris tissue.
    • The presence of mesodermal pupillary membranes was observed in conjunction with the absence of a fully formed iris.

    Findings:

    • The co-occurrence of persistent pupillary membranes (mesodermal origin) and aniridia (potentially neuroectodermal origin) was documented.

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  • This specific presentation challenges the notion of a purely mesodermal or neuroectodermal defect in all aniridia cases.
  • The findings point towards a primary neuroectodermal developmental issue as the likely cause in this patient.

    • Implications:

    • This case provides evidence supporting a neuroectodermal origin for certain forms of congenital aniridia.
    • Understanding the precise embryologic origins can refine diagnostic approaches and genetic counseling for aniridia.
    • Further research into the molecular pathways governing iris development is warranted to elucidate the pathogenesis of aniridia.