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A histopathologic review of 168 cases of preretinal membrane
Abstract:
In 168 eyes with preretinal membranes studied histopathologically, five major distinct types of membranes were categorized: 61 glial, 28 fibrous, 22 cortical vitreous, 16 retinal pigment epithelium, 15 fibroinflammatory, 24 combinations, and one endothelial and melanomatous membrane each. The overall prevalence of preretinal membranes was 5.5% in 2,000 cases studied. Selected cases examined by electron microscopy were supportive of the origin of the cells in the preretinal membranes in the glial, fibrous, and retinal pigment epithelial types. Glial preretinal membranes occurred as the result of defects in the internal limiting membrane, such as retinal pits or holes, and from the optic nerve head in association with posterior vitreous detachment. Fibrous preretinal membranes were associated with proliferative retinopathy and long-standing retinal detachment. Studies of the cellular origin of these membranes were inconclusive. The cortical vitreous type of preretinal membrane was hypocellular and occurred in the absence of associated ocular abnormalities. Pigment epithelial preretinal membranes occurred in eyes with rhegmatogenous retinal detachment.
Insights
Preretinal membranes, affecting 5.5% of eyes, were classified into five main types: glial, fibrous, cortical vitreous, retinal pigment epithelium, and fibroinflammatory. Histopathology and electron microscopy identified cellular origins for some types.
Area of Science:
- Ophthalmology
- Pathology
Background:
- Preretinal membranes (PRMs) are a significant cause of visual impairment.
- Understanding the histopathological classification and cellular origins of PRMs is crucial for diagnosis and treatment.
Observation:
- A histopathological study of 168 eyes identified five major types of preretinal membranes: glial, fibrous, cortical vitreous, retinal pigment epithelium, and fibroinflammatory.
- The overall prevalence of PRMs was found to be 5.5% in a cohort of 2,000 cases.
- Electron microscopy supported the cellular origin of glial, fibrous, and retinal pigment epithelial PRMs.
Findings:
- Glial PRMs arise from internal limiting membrane defects or optic nerve head issues linked to posterior vitreous detachment.
- Fibrous PRMs are associated with proliferative retinopathy and chronic retinal detachment.
- Cortical vitreous PRMs are hypocellular and occur without ocular abnormalities, while pigment epithelial PRMs are linked to rhegmatogenous retinal detachment.
Implications:
- This classification provides a framework for understanding the diverse origins and associations of preretinal membranes.
- Further research into the cellular origins of fibrous PRMs is warranted.
- Accurate histopathological typing may guide therapeutic strategies for visual impairment caused by preretinal membranes.