Figure 2a. Fascia-based nodular fasciitis in the forearm of a 34-year-old woman with a clinical history of a palpable, rapidly enlarging mass. (a) Axial T1-weighted image shows a 3-cm mass (arrow) in the fascia along the radial aspect of the forearm. (b) Coronal short inversion time inversion recovery image shows linear extension of the lesion (arrows) superficially along the fascia. Although the lesion has nonspecific high signal intensity, nodular fasciitis should be the primary diagnostic consideration because of the lesion’s small size and forearm location and the patient’s age and clinical history.