Clinical manifestations in thrombotic children with factor V Leiden mutation

Sixty-three children with thrombosis were screened for factor V Leiden (FVL ) and the mutation was found in 20 patients, 5 of whom were homozygous for FVL. The clinical features of 15 heterozygous and 5 homozygous patients wit h factor V Leiden mutation were analyzed. Additional risk factors were foun d in 19 of these 20 patients (95%) with FVL mutation. The most frequent pre disposing exogenous factor was infection. The majority of children with FVL mutation had had several associated disorders prior to their vascular occl usion, such as homocystinuria, Behcet's disease, collagen tissue disorders, and hypereosinophilia. Homozygous mutation in two children led to amputati on of legs due to purpura fulminans. Cerebral thrombosis as cerebral infarc t was frequent among children with FVL mutation.