Objective: To determine which venous malformations (VMs) are at risk for coagulopathy.Venous malformations are slow-flow vascular malformations present at birth, and localized intravascular coagulopathy (LIC) causes pain and thrombosis within a lesion and severe bleeding during surgical procedures.Design: Prospective convenience sample accrued from 2 multidisciplinary sites in Brussels, Belgium, and Caen, France. Participants:The study population comprised 140 patients with clinical data and coagulation parameters.Magnetic resonance imaging was performed for 110 patients.Main Outcome Measure: Measurement of D-dimer levels.Results: Of the 140 participants, 59 (42%) showed high D-dimer levels, 36 (61%) of whom had levels higher than 1.0 µg/mL.Six of the participants had low fibrinogen levels.In univariate analysis, large surface, presence of pal-

Association of Localized Intravascular Coagulopathy With Venous Malformations