Paracentral acute middle maculopathy: precursor to macular thinning in sickle cell retinopathy

Area of Science:

• Ophthalmology
• Hematology
• Retinal Vascular Diseases

Background:

• Sickle cell disease (SCD) is a systemic disorder that can affect the eyes, leading to various complications.
• Retinopathy in SCD is often characterized by gradual capillary loss and neovascularization.
• Macular thinning is a common finding in patients with advanced sickle cell retinopathy.

Observation:

• A case of paracentral acute middle maculopathy (PAMM) was identified in a patient with sickle cell disease.
• PAMM involves acute damage to the superficial and intermediate capillary plexuses.
• The affected area in this case was the macula, crucial for central vision.

Findings:

• The presented case suggests PAMM could be an early, precursor lesion to the macular thinning typically seen in sickle cell disease.
• This indicates that acute vascular events, not just gradual loss, may play a role in SCD pathophysiology.
• Fluorescein angiography may not detect these acute vascular changes occurring in the deep capillary plexus.

Implications:

• Recognizing PAMM as a potential precursor lesion could lead to earlier diagnosis and intervention in sickle cell retinopathy.
• This finding may necessitate the development of novel imaging techniques or diagnostic criteria for early detection.
• Understanding PAMM's role could refine our understanding of the vascular complications of sickle cell disease.