Pachydrusen, choroidal vascular hyperpermeability, and punctate hyperfluorescent spots

Abstract

Purpose: To investigate the relationship between pachydrusen and features of choroidal vascular hyperpermeability (CVH) and punctate hyperfluorescent spots (PHS) on serial imaging in patients with polypoidal choroidal vasculopathy (PCV) or pachychoroid neovasculopathy (PNV).

Methods: Patients diagnosed between January 2007 and June 2016 at 2 high-volume, tertiary hospitals were retrospectively reviewed with serial multimodal imaging assessment. The primary outcome was the association between drusen subtypes (hard/soft drusen, subretinal drusenoid droplets, or pachydrusen) with CVH and PHS, previously described in central serous chorioretinopathy.

Results: Among the 105 eyes (105 patients; mean age, 67.0 years), 87 (82.9%) were diagnosed with PCV and 18 (17.1%) with PNV. Pachydrusen was the most frequently identified subtype (54 eyes, 51.4%). CVH (72.2% vs 41.4%, P = 0.021) and PHS (72.2% vs 44.8%, P = 0.041) were observed with greater frequency in PNV eyes. Significant correlations were found between CVH and PHS (phi coefficient φ 0.30, P = 0.003), and PHS with pachydrusen (φ 0.20, P = 0.040). Over a mean follow-up of 74.8 months, new drusen co-localizing to PHS were noted in 22 (21.0%) eyes (φ 0.54, P < 0.001).

Conclusion: We observed a trend of pachydrusen appearing in conjunction with PHS in PCV or PNV. Frequent localization of new drusen to these choroidal lesions was observed over long-term follow-up. PHS may be a form of late-staining "forme fruste" drusen, possibly associated with micro-ischemic changes to the choriocapillaris.

Keywords: Indocyanine-green angiography; Optical coherence tomography angiography; Pachychoroid; Pachydrusen; Polypoidal choroidal vasculopathy.