IMT is a low-grade spindle cell neoplasm typically associated with anaplastic lymphoma kinase (ALK) and more rarely with ROS oncoprotein (ROS1) or neurotrophic tropomyosin kinase receptor (NTRK) rearrangements and a less aggressive clinical course compared to DDLPS [17–19]. The gene discussed is ROS1; the disease is inflammatory myofibroblastic tumor.