Morphological changes of nodular fasciitis. (A) Spindle cells were diffused in extensive myxoid stroma. At the margin of the tumor, the cells infiltrated the normal skeletal muscle tissue. (B) Focally, keloid like collagen bundles present in the peripheral area. (C) Extravasated erythrocytes, scattered osteoclast-like giant cells were sprinkled between the plump myofibroblasts (D) Numerous mitoses (black arrow) were present.
Lin et al. Diagnostic Pathology 2013 8:50 doi:10.1186/1746-1596-8-50