Figure 10a. Sclerosing stromal tumor in a 32-year-old woman. Sagittal T2- and T1-weighted MR images show that there is a huge, predominantly solid mass in front of the uterus. (a) T2-weighted image shows that the mass is composed of an admixture of low-signal-intensity nodules (arrows) set against the high-signal-intensity stroma. (b) Contrast-enhanced T1-weighted image shows that the nodules (arrows) enhance more than the stroma. The resected specimen was a huge, yellowish, solid tumor with edematous change and weighed 1,550 g. (c) Loupe image of the specimen (H-E stain) shows a pseudolobular pattern, in which cellular pseudolobules are separated by edematous hypocellular fibrous tissue. The finding of low-signal-intensity nodules within the high-signal-intensity stroma at T2-weighted imaging corresponds to the pseudolobular pattern. The cellular components of the nodules consist of a disorganized admixture of fibroblasts and rounded, vacuolated cells.