Figure 2c. Mature cystic teratoma of the ovary in a 27-year-old woman. (a) Axial in-phase gradient-echo MR image (repetition time msec/echo time msec = 120/4.4) shows a heterogeneous predominantly hyperintense mass in the right ovary (arrow). The hyperintense component is consistent with fat or hemorrhage. (b) Axial out-of-phase gradient-echo MR image (120/2.2) shows partial signal loss in the central nodule. More important, there is dramatic signal loss at the interface between the lesion and the water-based ovarian tissue stretched around it (arrowheads). This finding indicates that the lesion contains fat. (c) Axial gadolinium-enhanced fat saturation T1-weighted MR image shows marked signal loss (arrow) relative to the signal intensity on the in-phase image (a), an appearance indicative of a predominantly macroscopic fatty component.