Our data show that non-genetic and particular iatrogenic risk factors can often be identified in children with thrombosis, but activated protein C resistance and protein C deficiency are significant genetic risk factors in this age group.

We report a 15-year-old boy with patent ductus venosus in whom the diagnosis was made by MR angiography. A patent ductus venosus Arantii is a rare form of portosystemic shunt. Only a few cases have been reported in adults and children. The diagnosis is usually made by US and digital subtraction angiography. In our patient, the diagnosis was first made by MR angiography. This demonstrates the excellent diagnostic potential of the method in paediatric patients.

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