Figure 6. Endometriosis of the serosal surface of the uterus. T₁ weighted spin echo (T1WSE) (a) and T₂ weighted turbo spin echo (T2WTSE) (b) sagittal images of the uterus showing mixed high and low signal foci on the posterior superior surface of the uterus (arrowheads) on T1WSE, which are of high signal intensity on T2WTSE.