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Autosomal-dominant fundus flavimaculatus. Clinicopathologic correlation
P F Lopez1, I H Maumenee, Z de la Cruz
1Eye Pathology Laboratory, Johns Hopkins Hospital, Baltimore, MD 21205.
Ophthalmology
|June 1, 1990
Summary
This study details a clinicopathologic analysis of autosomal-dominant fundus flavimaculatus. It reveals abnormal material accumulation in the retinal pigment epithelium, suggesting a shared end-stage for related genetic disorders.
Area of Science:
- Ophthalmology
- Genetics
- Cell Biology
Background:
- Autosomal-dominant fundus flavimaculatus is a rare genetic disorder affecting vision.
- Late-onset atrophic macular degeneration can be a manifestation of this condition.
- Clinicopathologic studies are crucial for understanding disease mechanisms.
Observation:
- A 62-year-old male patient with autosomal-dominant fundus flavimaculatus and late-onset atrophic macular degeneration was studied.
- Histopathology revealed the retinal pigment epithelium (RPE) distended by a specific material.
- Transmission electron microscopy identified abnormal granule accumulation within the RPE.
Findings:
- The distending material in the RPE was periodic acid-Schiff (PAS)-positive and acid mucopolysaccharide-negative.
- Marked accumulation of lipofuscin and melanolipofuscin granules was observed in the RPE.
- Ultrastructural heterogeneity was noted, suggesting distinct underlying genetic causes.
Implications:
- Fundus flavimaculatus may represent a clinical syndrome with multiple distinct genetic and mechanistic origins.
- A common end-stage involves similar topographic accumulation of lipofuscin in the RPE.
- Further research into these distinct pathways could lead to targeted therapies for fundus flavimaculatus and related macular degenerations.