Figure. 5 Magnetic resonance imaging shows the lesion in the left inguinal region is low signal on T1WI (a); the lesion shows significantly inhomogeneous high signal on fat-saturated T2WI with still clear borders (b); the lesion shows inhomogeneous enhancement after enhancement (c); the left posterior femoral lesion shows hyposignal on T1WI (d); the lesion shows mixed hyperintensity on fat-saturated T2WI, irregular strips of low signal are seen within it, edge undercooling (e); the lesion shows significant inhomogeneous strengthening after enhancement (f).