Klippel-Trenaunay syndrome: Magnetic resonance imaging

Eight-year-old girl with Klippel-Trenaunay syndrome involving the right lower extremity.
(A) Coronal short T1 inversion recovery of bilateral thighs, demonstrating limb hypertrophy, enlarged lateral marginal vein (arrow), multifocal macrocystic lymphatic malformation (arrowheads), and diffuse intramuscular microcystic lymphatic versus venous malformation (asterisk). The lateral marginal vein drained to a persistent sciatic vein (not shown).
(B) Stitched coronal post-gadolinium T1 gradient image demonstrating patency of the enlarged lateral marginal vein (arrow) and expected lack of central enhancement in the macrocystic portion of the lymphatic malformation (arrowhead).