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Figure 9a. Musculoskeletal fibromatosis in the paraspinal region in a 20-year-old man. (a) Axial T1-weighted (800/20) SE MR image shows markedly decreased signal intensity within a well-defined mass (arrows), a finding indicative of a densely collagenous hypocellular lesion. The mass extends across the midline (arrowheads). T2-weighted images (not shown) also showed decreased signal intensity in the mass. (b) Corresponding contrast-enhanced CT image shows enhancement of the lesion and small fascial "tails" (arrowheads).
