Fig. 2: Fibroma of tendon sheath.

Representative images of case #2 (A), case # 13 (B), case #15 (C, D) and case #8 (E, F). Note the variation in cellularity and relatively prominent vessels in all cases. Note keloid-like fibers—focal in A and extensive in F. A lesion diagnosed as fibroma of tendon sheath (G, H) but lacking a USP6 fusion may be a scar rather than a fibroma of tendon sheath. Note poor demarcation from the surrounding fibrous tissue (H).