A, Fundus photograph (top), infrared, and spectral-domain (SD) optical coherence tomography (OCT) of case 1 at baseline. Spectral-domain OCT reveals a hyperreflective band from the Henle fiber layer to the interdigitation zone (arrowheads). B, Fundus photograph (top), infrared, and SD-OCT 2 weeks later. Spectral-domain OCT demonstrates regression of the hyperreflective band, with associated thinning of the outer nuclear layer and disrupted underlying external limiting membrane, ellipsoid zone, and interdigitation zone (arrowheads). C, Fundus photograph (top), infrared, and SD-OCT at the last visit. Spectral-domain OCT shows complete restoration of the external limiting membrane and ellipsoid zone and discrete interdigitation zone (arrowheads). For A, B, and C, the images on the second row are of the right eye and those on the third row are of the left eye. Also in the second and third rows, infrared images are on the left and SD-OCT images on the right.
A, Fundus photograph, autofluorescence, infrared, and spectral-domain (SD) optical coherence tomography (OCT) of case 2 at baseline. Spectral-domain OCT reveals hyperreflection extended from the Henle fiber layer to the ellipsoid zone and patchy dropout of the interdigitation zone (arrowheads). B, Fundus photograph, autofluorescence, infrared, and SD-OCT results 2 weeks later. Spectral-domain OCT demonstrates a decrease in size and intensity of the hyperreflective bands, accompanied by subtle outer nuclear layer thinning and disruption of the external limiting membrane, ellipsoid zone, and interdigitation zone (arrowheads). C, Fundus photograph, autofluorescence, infrared, and SD-OCT at the 6-month follow-up. Spectral-domain OCT shows a continued decrease in hyperreflection in addition to external limiting membrane and ellipsoid zone reconstruction; the interdigitation zone remains disrupted (arrowheads).
Li M, Zhang X, Ji Y, Ye B, Wen F. Acute Macular Neuroretinopathy in Dengue FeverShort-term Prospectively Followed Up Case Series. JAMA Ophthalmol. 2015;133(11):1329-1333. doi:10.1001/jamaophthalmol.2015.2687
The incidence of dengue fever (DF) increases every year. Macular complications of patients with DF may be more common than many ophthalmologists realize. During a DF outbreak in South China in 2014, we observed acute macular neuroretinopathy associated with DF.
Among 9 patients (17 eyes) with maculopathy post-DF, 5 patients (55.6%) (9 eyes) manifesting acute macular neuroretinopathy were recruited from August 1, 2014, to September 30, 2014, with a 6-month ophthalmic follow-up. Infrared reflectance imaging demonstrated localized areas of hyporeflection in the macula. Spectral-domain (SD) optical coherence tomography (OCT) scanning through these areas revealed hyperreflection in the photoreceptor layer and disruption of its normal reflective structures. Subsequent SD-OCT demonstrated that the hyperreflection of the photoreceptor layer regressed gradually, followed by thinning of the outer nuclear layer. The external limiting membrane and ellipsoid zone became continuous; however, the interdigitation zone was not restored. The scotomas persisted in all 5 patients (9 eyes) by the last visit. All 5 patients (9 eyes) in this case series were complicated with classic dengue maculopathy signs, such as intraretinal hemorrhage and exudation, which were completely resolved during the follow-up.
Conclusions and Relevance
These data suggest that acute macular neuroretinopathy is a major manifestation of dengue maculopathy, with persistent scotomas through at least 6 months.
Dengue fever (DF) is a mosquito-transmitted viral epidemic mainly affecting the Americas, Southeast Asia, and the Western Pacific.1 The incidence of DF increases every year. In particular, the DF outbreak caused by the serotype 1 dengue virus that occurred in South China’s Guangdong Province in 2014 was the worst outbreak of the past 2 decades.2,3
Following epidemics of DF, ocular complications in the macula may be more common than some ophthalmologists realize. The prevalence of dengue maculopathy among patients hospitalized with dengue infection was estimated to be 10%.4 The reported manifestations of dengue maculopathy include foveolitis, macular hemorrhage, and edema associated with arteriolar sheathing, cotton wool spots, perifoveal telangiectasia, and microaneurysms.5 Here, we present acute macular neuroretinopathy (AMN) post-DF observed during the outbreak in South China in 2014.
To present acute macular neuroretinopathy (AMN) findings post–dengue fever, of which there was an outbreak in South China in 2014.
Five of 9 patients (9 eyes) with dengue maculopathy (55.6%) manifested AMN in our series.
Acute macular neuroretinopathy post–dengue fever was readily identifiable on infrared reflectance imaging and spectral-domain optical coherence tomography.
All eyes with AMN left persistent scotomas through 6-month follow-up.
This study involved patients with dengue maculopathy who were referred to the macular disease service of the Zhongshan Ophthalmic Center from August 1, 2014, to September 30, 2014. Patients who presented with AMN were included. Dengue maculopathy was defined as the presence of lesions in the posterior pole that were not attributable to other conditions with known ocular involvement and that appeared within 1 month after the onset of DF symptoms. All of the diagnoses of DF were confirmed by serum polymerase chain reaction assay (fever for < 5 days) or dengue serology (after 5 days of fever). Patients were considered to have AMN based on the following criteria: (1) history of acute onset of scotoma with or without a decrease in visual acuity; (2) hyporeflective lesions on infrared (IR) reflectance imaging and spectral-domain (SD) optical coherence tomography (OCT) findings that revealed hyperreflection in the photoreceptor layer; and (3) corresponding lesions on fundus fluorescein angiography (FFA) that were normal.6
The patients were evaluated every 2 weeks over 6 months of follow-up. Each patient underwent best-corrected visual acuity measurement with Snellen charts, slitlamp examination, dilated fundoscopy, fundus photography (Carl Zeiss Inc and Topcon Medical Systems), fundus autofluorescence (FAF; excitation 488 nm), FFA, IR reflectance, and SD-OCT imaging (Heidelberg Engineering). Subsequently, FAF, IR reflectance, and SD-OCT imaging were conducted during the follow-up. All of the procedures in this study adhered to the tenets of the Declaration of Helsinki7 and were approved by the institutional review board of the Zhongshan Ophthalmic Center at Sun Yat-sen University. All patients provided written informed consent.
Nine patients (17 eyes) with dengue maculopathy were referred to our clinic. Five of them (55.6%) (9 eyes, 52.9%; 3 women and 2 men) manifested AMN and were included in our series. The other 3 patients experienced intraretinal hemorrhages and/or fundus changes caused by increased retinal vascular leakage (stellate exudation, edema, and vasculitis), and 1 presented with a central artery occlusion. The demographic data and clinical presentations of the 5 patients are summarized in Table 1 and Table 2.
The median age of the patients with AMN was 38 years (range, 16-49 years). The involvement of AMN lesions was bilateral in 4 cases and unilateral in 1 case. Central/paracentral scotoma was the main visual symptom. The visual acuity varied from 20/20 to 20/667, depending on whether the fovea was involved. The median interval between the onset of visual symptoms and the systemic manifestations was 5 days (range, 3-7 days), which did not overlap with the febrile episode.
The fundus findings of the AMN lesions were normal (left eye of case 1; Figure 1A) or wedge-shape/patchy lesions with yellowish-white/brownish color in the macula (Figure 2A). There were no remarkable findings of the AMN lesions on FFA. On FAF, subtle streaks of hypoautofluorescence were detected in the macula of 1 patient (case 2; Figure 2A); the other 4 appeared normal. Images obtained by IR reflectance and SD-OCT were the most characteristic. The AMN lesions appeared as hyporeflective areas on IR reflectance imaging and were more precisely delineated compared with the fundus photographs. Spectral-domain OCT scanning through the IR defects revealed hyperreflection in the photoreceptor layer, with disruption of its normal reflective structures (Figure 1A and Figure 2A). The attenuation of hyperreflection began within the first 2-week follow-up interval, and it partially remained in the Henle fiber layer at the 24th week. Thinning of the outer nuclear layer accompanied the attenuation of the hyperreflection in the photoreceptor layer and was irreversible. Subsequently, the external limiting membrane and ellipsoid zone began to restore, and the continuity was nearly completely reconstructed. However, little restoration of the interdigitation zone was observed by the last visit (Figure 1B and C; Figure 2B and C).
In addition to the AMN lesions, all 5 patients (9 eyes) in our series were found to have classic dengue maculopathy signs such as intraretinal hemorrhage and exudation. All of these lesions completely resolved during the follow-up.
One patient (case 1) was given systemic corticosteroid therapy for the combined mild optic disc edema in both eyes. The remaining 4 patients were observed without any treatment. All 5 patients obtained varying degrees of visual acuity improvement but had persistent central/paracentral scotomas.
Flulike symptoms have been reported preceding AMN, and other associated factors include the use of oral contraceptives, injection of adrenaline, use of norepinephrine, trauma, and caffeine use.8 This series confirms AMN associated with DF.
In this series, 55.6% of patients with dengue maculopathy had AMN. These data must be interpreted with caution because a referral bias may exist in this series, which was recruited from a terminal referral center specialized in ophthalmology. Dengue fever is a systemic disease requiring general medical care. Cases with dengue maculopathy referred to our center tend to be relatively severe ones. All 5 patients in our series reported persistent scotomas with minimal relief. The cause of their persistent scotomas could have been related to the irreversible thinning of the outer nuclear layer and incomplete restoration of the interdigitation zone, which are the sequelae of AMN.6,9 Acute macular neuroretinopathy presented essentially normal on ophthalmoscopic examination or FFA. The hyperreflection of AMN lesions on SD-OCT imaging attenuated fast within a 2-week follow-up interval. Spectral-domain OCT applied before the attenuation of the lesions could facilitate the diagnosis of AMN in dengue maculopathy. Teoh et al10 used time-domain OCT to study the prognosis and proposed 3 patterns of dengue maculopathy as diffuse retinal thickening (type 1), cystoid macular edema (type 2), and foveolitis (type 3). All the structural abnormality returned spontaneously to normal within a few days; however, scotomas persisted in 30.3% of eyes with type 1, 56.3% of eyes with type 2, and 100% with type 3 maculopathy. We assumed that most type 3 maculopathies described by Teoh et al10 should be AMN, which was not realized owing to the limitation of the time-domain OCT. Moreover, a previous case report11 of dengue maculopathy noted outer nuclear layer thinning and ellipsoid zone disruption, which resembled the later phase of AMN.
There is no established treatment for dengue eye disease. Observation and corticosteroid were the 2 main treatment modalities. Corticosteroid was applied when severe maculopathy, uveitis, optic neuritis, and neuromyelitis optica occurred, with inconsistent treatment response.1 The systemic corticosteroid prescribed to case 1 in our series did not help in relieving her scotomas.
In summary, AMN is a major manifestation of dengue maculopathy with persistent scotomas through at least 6 months in our series.
Corresponding Author: Feng Wen, MD, PhD, State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, 54 S Xianlie Rd, Guangzhou 510060, China (email@example.com).
Submitted for Publication: May 21, 2015; final revision received June 15, 2015; accepted June 20, 2015.
Published Online: August 13, 2015. doi:10.1001/jamaophthalmol.2015.2687.
Author Contributions: Dr Li had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Li.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Li, Zhang.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Li.
Obtained funding: Wen.
Administrative, technical, or material support: Zhang, Ji, Wen.
Study supervision: Zhang, Wen.
Conflict of Interest Disclosures: All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest and none were reported.
Funding/Support: This study was supported by the National Natural Science Foundation of China (grant 81470647) and the Fundamental Research Funds of State Key Laboratory of Ophthalmology.
Role of the Funder/Sponsor: The funders had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.