Figure 3b. Scar endometrioma in a 37-year-old woman who had undergone a cesarean section 3 years before and was experiencing cyclic periumbilical pain. (a) Color Doppler US image demonstrates a small hypoechoic mass with blood flow in a subcutaneous periumbilical location. (b) Axial T1-weighted spin-echo MR image (repetition time msec/echo time msec = 450/10) obtained with fat suppression and gadolinium shows enhancement of the mass.