Clinicopathological features of epiretinal membranes in eyes filled with silicone oil
Received 16 July 2018
Accepted for publication 27 August 2018
Published 4 October 2018 Volume 2018:12 Pages 1949—1957
Checked for plagiarism Yes
Review by Single-blind
Peer reviewer comments 3
Editor who approved publication: Dr Scott Fraser
Yoshiaki Tanaka,1 Fumihiko Toyoda,1 Machiko Shimmura-Tomita,1 Nozomi Kinoshita,1 Hiroko Takano,1 Yoh Dobashi,2 Shigeki Yamada,2 Hiroto Obata,3 Akihiro Kakehashi1
1Department of Ophthalmology, Saitama Medical Center, Jichi Medical University, Saitama, Japan; 2Department of Pathology, Saitama Medical Center, Jichi Medical University, Saitama, Japan; 3Department of Ophthalmology, Saitama Medical Center, Saitama Medical University, Kawagoe, Japan
Purpose: The aim of this case series was to clarify the clinicopathological features of epiretinal membranes (ERMs) that developed in eyes after silicone oil (SO) tamponade to treat rhegmatogenous retinal detachments (RRDs).
Patients and methods: In the Department of Ophthalmology, Saitama Medical Center, Jichi Medical University, patients with idiopathic ERMs (23 eyes) and ERMs in eyes filled with SO (SO ERMs) after vitreous surgery to treat RRDs (nine eyes) were enrolled from July 2012 to March 2014. ERM tissues obtained intraoperatively were examined histopathologically. Besides the main outcome measure of the pathological findings of the ERM tissues, other outcome measures included the preoperative findings on optical coherence tomography (OCT) images and the surgical findings.
Results: Eight (89%) of nine eyes with SO ERMs had bilayered membranes composed of a firm layer on the retinal side with glial cells and extracellular matrix and a fragile sponge-like layer on the vitreous side. The sponge-like layer was composed of emulsified SO surrounded by macrophages. Quantitative analysis showed that the areas with cluster of differentiation 68 (CD68)-positive macrophages identified by immunohistochemistry in eyes with SO ERMs were significantly (P<0.001) larger than those in eyes with idiopathic ERMs. The findings on OCT images were consistent with the pathological features of the SO ERMs. Surgical removal of the SO ERMs was difficult because the sponge-like layer was fragile, and the underlying retina was also fragile due to inflammation.
Conclusion: SO ERMs are bilayered membranes. Long-standing emulsified SO formed a sponge-like layer and SO (foreign body)-induced granulation and caused retinal inflammation in these eyes, making surgical removal difficult. A preoperative OCT examination is necessary to identify SO ERMs.
Keywords: epiretinal membrane, optical coherence tomography, pathological feature, rhegmatogenous retinal detachment, silicone oil, vitrectomy
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