Clinical and multimodal imaging features of acute macular neuroretinopathy lesions following recent SARS-CoV-2 infection

AIM: To describe the clinical characteristics of eyes using multimodal imaging features with acute macular neuroretinopathy(AMN) lesions following severe acute respiratory syndrome coronavirus 2(SARS-CoV-2) infection. METHODS: Retrospective case series study. From December 18, 2022 to February 14, 2023, previously healthy cases within 1-week infection with SARS-CoV-2 and examined at Tianjin Eye Hospital to confirm the diagnosis of AMN were included in the study. Totally 5 males and 9 females [mean age: 29.93±10.32(16-49)y] were presented for reduced vision, with or without blurred vision. All patients underwent best corrected visual acuity(BCVA), intraocular pressure, slit lamp microscopy, indirect fundoscopy. Simultaneously, multimodal imagings fundus photography(45° or 200° field of view) was performed in 7 cases(14 eyes). Near infrared(NIR) fundus photography was performed in 9 cases(18 eyes), optical coherence tomography(OCT) in 5 cases(10 eyes), optical coherence tomography angiography(OCTA) in 9 cases(18 eyes), and fundus fluorescence angiography(FFA) in 3 cases(6 eyes). Visual field was performed in 1 case(2 eyes). RESULTS: Multimodal imaging findings data from 14 patients with AMN were reviewed. All eyes demonstrated different extent hyperreflective lesions at the level of the inner nuclear layer and/or outer plexus layer on OCT or OCTA. Fundus photography(45° or 200° field of view) showed irregular hypo-reflective lesion around the fovea in 7 cases(14 eyes). OCTA demonstrated that the superficial retinal capillary plexus(SCP) vascular density, deep capillary plexus(DCP) vascular density and choriocapillaris(CC) vascular density was reduced in 9 case(18 eyes). Among the follow-up cases(2 cases), vascular density increased in 1 case with elevated BCVA; another case has vascular density decrease in one eye and basically unchanged in other eye. En face images of the ellipsoidal zone and interdigitation zone injury showed a low wedge-shaped reflection contour appearance. NIR image mainly show the absence of the outer retinal interdigitation zone in AMN. No abnormal fluorescence was observed in FFA. Corresponding partial defect of the visual field were visualized via perimeter in one case.CONCLUSION: The morbidity of SARS-CoV-2 infection with AMN is increased. Ophthalmologists should be aware of the possible, albeit rare, AMN after SARS-CoV-2 infection and focus on multimodal imaging features. OCT, OCTA, and infrared fundus phase are proved to be valuable tools for detection of AMN in patients with SARS-CoV-2.