황반부 망막전막 환자에서 내경계막 제거 후 발생한 시야 결손
Visual Field Defect Developed after Internal Limiting Membrane Peeling in a Patient with Epiretinal Membrane
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목적: 황반부 망막전막 환자에서 내경계막 제거술 후 생긴 시야결손 증례를 보고하고자 한다. 증례요약: 특이병력이 없는 33세 여자 환자가 3년간의 점진적인 우안 시력 감소를 주소로 내원하였다. 안과적 검사에서 황반부 망막전 막으로 진단받고 유리체 절제술을 시행받았다. 황반부 망막전막 제거 후 내경계막 벗김 중 상측 혈관궁 아래에서 망막 출혈이 발생하 였고, 투과전자현미경 검사에서 뮐러세포의 단편 조각이 내경계막의 망막면에서 관찰되었다. 망막 출혈은 술 후 2주 째 흡수되었으나, 술 후 3개월째 망막 출혈이 발생하였던 위치에서 망막신경섬유층 손상이 관찰되었다. 빛간섭단층촬영검사에서 상이측의 국소적인 망 막신경섬유의 두께 감소가 관찰되었고, 자동 시야 검사에서 이에 합당하는 하부 시야 결손이 확인되었다. 경과관찰 기간 동안 안압은 정상이었고, 시신경 유두에서 녹내장성 변화는 관찰되지 않았다. 결론: 본 증례를 통하여 유리체 절제술 후 시야결손이 발생하였을 경우, 내경계막의 제거로 인한 망막신경섬유층의 손상과 연관되어 발생할 수 있음을 알 수 있었다.
Abstract
Purpose: To report a case of visual field defect developed after internal limiting membrane (ILM) peeling in a patient with macular epiretinal membrane (ERM). Case summary: A 33-year-old female without a history of specific diseases presented with a gradually decreased visual acuity in the right eye for 3 years. The patient was diagnosed as having macular ERM and underwent vitrectomy. During ILM peeling, retinal hemorrhage occurred in the superior region of macula, which spontaneously disappeared 2 weeks after surgery. Transmission electron microscopy showed Müller cell end feet with damaged appearance adherent to the ILM. At 3 months after surgery, the patient developed retinal nerve fiber layer (RNFL) defect in the area where the spot retinal hemorrhage had occurred. Optical coherence tomography showed focal RNFL thinning in the superotemporal region. The automated perimetry revealed corresponding inferior nasal step and scotomas in the right eye. Intraocular pressure was normal throughout the follow-up period and there was no evidence of glaucomatous optic disc change. Conclusions: The results obtained from the patient in the present study indicated that visual field defect may be the result of a mechanical damage to the RNFL during ILM peeling.
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