In our case, it is easily to rule out diagnoses of inflammatory myofibroblastic tumor (IMT), aggressive fibromatosis, nodular fasciitis (NF), solitary fibrous tumor (SFT), since it is negative for ALK (5A4), β-catenin, SMA, Desmin, and CD34. The gene discussed is SMN1; the disease is inflammatory myofibroblastic tumor.