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Prepapillary vascular loop-a new classification

2020; Springer Nature; Volume: 35; Issue: 2 Linguagem: Inglês

10.1038/s41433-020-0859-3

1476-5454

Ahmad M. Mansour, Igor Kozák, Ali Osman Saatçi, Francisco J. Ascaso, Laura Broc, Maurízio Battaglia Parodi, Nuria Olivier Pascual, Pablo Gili, Jay Chhablani, Thomas R. Hedges, Ana Honrubia, Lourdes De Avila Gutierrez, Giacomo Panozzo, Jaume Catalá, Jesús Díaz, Elisa Carreras, Sibel Kadayıfçılar, Eman Saeed Kahtani, Sami H. Uwaydat, Luiz H. Lima, Hana A. Mansour, Hashim Ali Khan, Thomas M. Aaberg, Jerald A. Bovino, Alex P. Hunyor,

Retinal Imaging and Analysis

To analyze the ophthalmic characteristics of congenital prepapillary vascular loop (PVL) and to propose a new morphologic classification dividing the loops into six types.Collaborative multinational multicentre retrospective study of PVL cases.There was a total of 49 cases (61 eyes), 37 unilateral (75.5%) and 12 bilateral (24.5%), 32 arterial type (65.3%) and 18 venous type (36.7%) (one patient had either kind in each eye). The mean number of loops per eye was 2.7 (range, 1-7). The loops were asymptomatic in 42 cases (85.7%). Other findings included: the presence of cilioretinal artery (14 cases), retinal vascular tortuosity (26 cases), amaurosis fugax (1 case), branch retinal artery occlusion (1 case) and vitreous haemorrhage (3 cases). Six morphologic loop types could be discerned based on elevation (flat vs. elevated), shape (figure of 8 or corkscrew with hyaline sheath), number (multiple or single), location (central or peripheral), lumen size (arterial vs. arteriolar) and presence of vascular tortuosity or vitreous traction.PVL are usually asymptomatic and can be divided into six morphologic types with different pathogenesis during early embryogenesis.