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Figure 3c. Fascia-based nodular fasciitis in the proximal forearm of a 44-year-old man. (a) Axial T1-weighted image shows a well-defined 1.1 x 1.4-cm mass (arrow) with signal that is nearly isointense to that of skeletal muscle. The mass is centered on the bicipital aponeurosis and overlies the pronator teres muscle. (b) Axial T2-weighted fat-suppressed fast SE image shows homogeneous high signal intensity in the lesion (arrow). (c) Coronal T1-weighted fat-suppressed image shows diffuse enhancement of the lesion (arrow). (d) Photomicrograph (H-E stain) at intermediate power shows alternating cellularity and foci of myxoid degeneration (M), classic features of nodular fasciitis.
