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Congenital prepapillary vascular loops (PVL) are typically asymptomatic. This study proposes a new six-type classification for these vascular anomalies based on their morphology.

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Area of Science:

  • Ophthalmology
  • Vascular Biology
  • Embryology

Background:

  • Congenital prepapillary vascular loops (PVL) are vascular anomalies.
  • Understanding their characteristics is crucial for diagnosis and management.

Purpose of the Study:

  • To analyze the ophthalmic characteristics of congenital prepapillary vascular loops (PVL).
  • To propose a novel morphologic classification system for PVL, dividing them into six distinct types.

Main Methods:

  • A collaborative, multinational, multicenter retrospective study was conducted.
  • PVL cases were analyzed to identify ophthalmic characteristics and classify loop morphology.

Main Results:

  • The study included 49 cases (61 eyes), with a majority being unilateral (75.5%).
  • Arterial type loops were more common (65.3%) than venous type (36.7%).
  • Six morphologic types were identified based on elevation, shape, number, location, lumen size, and associated vascular features.

Conclusions:

  • Congenital prepapillary vascular loops are generally asymptomatic.
  • A new classification system categorizes PVL into six morphologic types, reflecting different embryogenic pathways.