Choroidal melanocytosis evaluation with enhanced depth imaging optical coherence tomography

Area of Science:

• Ophthalmology
• Medical Imaging
• Histopathology

Background:

• Choroidal melanocytosis is a rare condition involving pigment cell proliferation in the choroid.
• Understanding its structural impact is crucial for diagnosis and management.

Purpose of the Study:

• To evaluate the choroidal and retinal structural changes in unilateral choroidal melanocytosis using enhanced depth imaging optical coherence tomography (EDI-OCT).

Main Methods:

• A retrospective case series of 15 patients with unilateral choroidal melanocytosis.
• EDI-OCT imaging was performed to compare involved and uninvolved eyes.
• Analysis focused on retinal and choroidal layer thickness and tissue characteristics.

Main Results:

• Patients exhibited increased subfoveal choroidal thickness (mean 326.4 μm vs. 264.4 μm) and significantly thicker choroidal perivascular stromal tissue (51% increase) in affected eyes.
• Retinal layers were largely normal, with only one case showing outer retinal abnormalities.
• Deep tissue shadowing was observed in some cases.

Conclusions:

• EDI-OCT demonstrates that choroidal melanocytosis is characterized by thickened subfoveal choroid and increased perivascular stromal tissue.
• The overlying retina is minimally affected, suggesting the primary pathology lies within the choroidal stroma.