Figures 7, 8. (7) Massive subserosal leiomyoma with cystic degeneration in a 46-year-old woman. Sagittal images (not shown) demonstrated continuity of the mass with the uterine fundus. Axial T2-weighted fast SE MR image (a) and corresponding contrast-enhanced fat-suppressed T1-weighted gradient-echo MR image (b) show a large, heterogeneous pelvic mass. Most of the mass is of low to intermediate signal intensity on the T2-weighted image (a), an appearance suggestive of a leiomyoma. Several small foci of very high signal intensity on the T2-weighted image (a) and no enhancement on the contrast-enhanced image (b) represent cystic degeneration (arrows). (8) Leiomyoma with myxoid degeneration in a 49-year-old woman. (a) Axial T2-weighted fast SE MR image shows a well-circumscribed mass of the anterior uterus that has components of both low signal intensity (white *) and high signal intensity (black *) compared with that of the outer myometrium. (b) Contrast-enhanced fat-saturated T1-weighted gradient-echo MR image (repetition time msec/echo time msec = 500/3.3, 90° flip angle) obtained at the same level as a shows that some of the intratumoral tissue with high signal intensity on the T2-weighted image (a) enhances. The enhancement indicates that this tissue does not represent intratumoral cysts or necrosis. (c) Photomicrograph (original magnification, x40; hematoxylin-eosin stain) of a myxoid leiomyoma in another patient shows loose, water-laden myxoid tissue (*), which contrasts with the denser smooth muscle bundles (arrow).