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A rationale for membrane peeling in the repair of stage 4 macular holes
1Vitreoretinal Service, Addenbrooke's NHS Trust, Hills Road, Cambridge, UK.
Aim:
To examine the histological and immunocytochemical characteristics of epiretinal membranes (ERM) associated with stage 4 macular holes (MH) so as to establish a vitreoretinal rationale for surgery in stage 4 MH.
Method:
Consecutive patients with stage 4 MH undergoing vitrectomy and membrane peeling were recruited. Preoperatively, the eyes were examined for ERM formation over the macula and completeness of posterior hyaloid membrane (PHM) separation from the retina. ERM peel specimens obtained during surgery were sent for histological and immunocytochemical studies and were compared with the PHM specimens taken from a previous post-mortem study of eyes with physiological posterior vitreous detachment but without macular holes.
Result:
A total of 13 patients with stage 4 MH fulfilled the inclusion criteria and were recruited. Preoperatively, all eyes had an ERM over the macula and incomplete separation of the PHM seen as a defect in the PHM on specular biomicroscopy. Histologically, the ERM specimens had very similar morphological characteristics to PHM, consisting of an eosinophilic membrane of varying thickness with scattered spindle-shaped cells. The membranes stained positively for type IV collagen while the cells were glial fibrillary acidic protein positive. Postoperatively, successful closure of MH was achieved in all cases.
Conclusion:
Stage 4 MH is characterised by incomplete separation of the PHM from the retina with remnants overlying the macula manifesting as ERM. Removal of the ERM is required during vitrectomy in order to relieve the tangential forces involved in the development of MH.
Insights
Stage 4 macular holes (MH) involve epiretinal membranes (ERM) due to incomplete posterior hyaloid membrane (PHM) separation. Removing ERM during vitrectomy is crucial for successful MH closure.
Area of Science:
- Ophthalmology
- Retinal Surgery
- Histopathology
Background:
- Stage 4 macular holes (MH) are characterized by the presence of epiretinal membranes (ERM).
- The role of the posterior hyaloid membrane (PHM) in MH development is not fully understood.
Purpose of the Study:
- To investigate the histological and immunocytochemical features of ERMs in stage 4 MH.
- To establish a vitreoretinal surgical rationale for stage 4 MH.
Main Methods:
- Histological and immunocytochemical analysis of ERM specimens from 13 patients undergoing vitrectomy.
- Comparison of ERM morphology with PHM from a post-mortem study.
Main Results:
- ERMs in stage 4 MH resemble PHM, composed of collagen IV and glial fibrillary acidic protein-positive cells.
- All patients achieved successful MH closure postoperatively.
- Preoperative findings included ERM and incomplete PHM separation.
Conclusions:
- Stage 4 MH is associated with ERM resulting from incomplete PHM separation.
- ERM removal during vitrectomy is essential to alleviate tangential forces and facilitate MH closure.
