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Ocular pathology in infantile type of neuronal ceroid-lipofuscinosis
Insights
Infantile ceroid-lipofuscinosis causes blindness by age two, characterized by rapid developmental delay and vision loss. Ocular pathology reveals severe retinal and optic nerve degeneration with granular deposits.
Area of Science:
- Ophthalmology
- Neuropathology
- Genetics
Background:
- Ceroid-lipofuscinosis, a group of rare genetic neurodegenerative disorders, presents with progressive vision loss and neurological decline.
- The infantile form (CLN1) typically manifests in early childhood with severe developmental impairment.
Observation:
- Autopsy of 10 eyes from five patients with confirmed infantile ceroid-lipofuscinosis.
- Clinical features include onset at 8-18 months, psychomotor retardation, ataxia, hypotonia, and blindness by age two.
Findings:
- Ophthalmoscopic examination revealed optic atrophy and retinal hypopigmentation.
- Histopathology showed complete loss of retinal neurons (visual, bipolar, ganglion cells), reactive gliosis, and pigment loss in the retinal pigment epithelium.
- Optic nerve atrophy and gliosis with demyelination were observed.
- PAS and Sudan black B stains identified granular deposits in the ciliary epithelium, retinal pigment epithelium, optic nerve glial cells, and retinal macrophages.
- Electron microscopy confirmed osmiophilic granular deposits within retinal glial cells.
Implications:
- This study details the specific ocular pathology in infantile ceroid-lipofuscinosis, highlighting the widespread neuronal and glial cell damage.
- Understanding these pathological changes is crucial for diagnosing and potentially developing therapeutic strategies for this devastating neurodegenerative disease.
- The presence of granular deposits provides insights into the cellular mechanisms of ceroid accumulation.
Abstract:
Ocular pathology of the infantile type of ceroid-lipofuscinosis is reported. The material comprised 10 eyes of five autopsies in which the diagnosis had been confirmed by neuropathological autopsy. The condition is clinically characterized by its age of onset from eight to 18 months, rapid psychomotor retardation, ataxia, and muscular hypotony. The patients become blind by the age of two years with optic atrophy and retinal hypopigmentation as the main ophthalmoscopic features. In the retina a complete disappearance of the visual cells, the bipolar cells and the ganglion cells was observed with marked reactive gliosis. Loss of pigment from the retinal pigment epithelium had taken place. The optic nerve showed atrophy and gliosis with complete loss of myelin sheaths. Granular deposits stainable with PAS, and Sudan black B stains were observed in the nonpigmented ciliary epithelium of the pars plana, the pigment epithelium as well as the glial cells of the optic nerve. Granular deposits were also noted in the cytoplasm of large pigmentladen macrophages in the retina. Electronmicroscopy revealed osmiophilic granular deposits in the cytoplasm of many retinal glial cells.