...22-year-old Japanese man with a...epithelioid inflammatory myofibroblastic sarcoma with RANBP2-ALK fusion….Subsequent administration of crizotinib, an oral anaplastic lymphoma kinase inhibitor, resulted in tumor shrinkage….Distinguishing epithelioid inflammatory myofibroblastic sarcoma from conventional inflammatory myofibroblastic tumor is important, and crizotinib is a promising treatment for this aggressive tumor.