"This 10 year-old male presented for assessment of leg length discrepancy and cutaneous “capillary” vascular malformation. The provisional diagnosis was Klippel-Trenaunay syndrome.

The axial fat-saturated T2 weighted MRI above shows dilated vascular structures in the right lower limb involving subcutaneous and multiple muscle compartments. Flow voids and pulsation artefact (particularly laterally) suggest a high flow component consistent with arteriovenous malformation. These findings favour Parkes Weber syndrome over Klippel-Trenaunay syndrome. There was no high output cardiac failure in this case.