Figure 1b. Subcutaneous fascia-based nodular fasciitis in the upper arm of a 38-year-old man. (a) Axial T1-weighted image shows a small nodule (arrow) localized to fascia on the lateral surface of the brachialis muscle. The lesion dimensions were 0.8 x 0.3 x 1.1 cm. (b) Photomicrograph (hematoxylineosin [H-E] stain) at low power demonstrates a well-circumscribed myxoid and spindle cell lesion (*) in fascia, centered between subcutaneous fat (A) and skeletal muscle (M).