Clinical Scorecard: Vascular Alterations in the Choroid of Eyes Affected by Acute Macular Neuroretinopathy and Paracentral Acute Middle Maculopathy: Fresh Perspectives

At a Glance

Key Highlights

• AMN presents with acute photopsia, paracentral scotoma, and outer retinal layer disruption detectable by OCT.
• PAMM is characterized by hyperreflectivity and subsequent thinning of the inner nuclear layer on OCT, distinct from AMN.
• Recent evidence suggests choroidal hypoperfusion and increased subfoveal choroidal thickness in AMN, contrasting with deep capillary plexus ischemia in PAMM.

Guideline-Based Recommendations

Diagnosis

• Use clinical examination and OCT imaging to identify hyperreflective lesions in outer retina for AMN and inner nuclear layer for PAMM.
• Employ near infrared reflectance imaging and OCT angiography to differentiate AMN from PAMM and assess vascular involvement.
• Exclude other macular pathologies and media opacities to ensure diagnostic accuracy.

Management

• Monitor patients longitudinally with OCT to assess resolution of hyperreflective lesions and retinal layer thinning.
• Consider patient history including viral symptoms and oral contraceptive use as potential triggers.
• No specific treatment detailed; management focuses on observation and supportive care.

Monitoring & Follow-up

• Perform baseline and follow-up SD-OCT imaging to measure subfoveal choroidal thickness and choroidal vascularity index.
• Assess best-corrected visual acuity (BCVA) and fundus examination regularly.
• Use AI-based software tools to enhance accuracy of choroidal vascular measurements.

Risks

• Potential for persistent visual field defects due to ischemic damage.
• Misdiagnosis due to overlapping features between AMN and PAMM without detailed imaging.
• Lack of established treatment protocols may delay intervention in progressive cases.

Patient & Prescribing Data

Young adults with acute onset paracentral scotomas, predominantly females and Caucasians, with possible history of viral illness or oral contraceptive use

No pharmacologic treatments specified; diagnosis relies on imaging and clinical correlation; management is observational with emphasis on monitoring vascular changes and visual function

Clinical Best Practices

• Utilize high-resolution spectral-domain OCT and OCT angiography for detailed retinal and choroidal vascular assessment.
• Apply standardized diagnostic criteria distinguishing AMN and PAMM based on retinal layer involvement and imaging features.
• Incorporate AI-based software to quantify choroidal thickness and vascularity indices for improved measurement reliability.
• Conduct longitudinal follow-up to document resolution of acute lesions and vascular alterations.
• Consider patient demographics and risk factors such as recent viral illness and contraceptive use in clinical evaluation.

References

• Bos and Deutman, 1975 - Original description of AMN
• Hashimoto et al. - Case report on choroidal involvement in AMN
• von der Burchard et al. - Study on choroidal hypoperfusion in AMN