Figure 2a. Typical TOA in a 33-year-old woman. (a) Axial T1-weighted MR image shows a left adnexal mass (solid arrows) with high signal intensity of the inner wall (arrowheads). Some hemorrhage is also noted (open arrow). (b) Axial T2-weighted MR image shows that the mass (solid arrows) is septate and cystic with a thick wall. The contents have high signal intensity, which is lower than that of a pure cyst. Meshlike strands in the pelvic fat planes (open arrows) are noted. (c) Axial contrast-enhanced T1-weighted MR image shows good enhancement of the wall and septa of the mass (white arrows). The meshlike strands in the pelvic fat planes (black arrows) also enhance well.