Atypical inguinal malignant peripheral nerve sheath tumour with arteriovenous fistula of the left femoral nerve in a child.

We report a 9-year-old girl who developed a malignant peripheral nerve sheath tumour (MPNST) with an arteriovenous fistula arising from the left femoral nerve and adjacent to the iliofemoral vessels in the ipsilateral groin, but without infiltrating them. We describe the MRI and MRA findings. Although MPNST is relatively well known and widely studied, the location of this mass is unique in a child.