inflammatory myofibroblastic tumor (MONDO_0015798) is a multinodular intermediate fibroblastic neoplasm that arises from soft tissue or viscera, in children and young adults. It is characterized by the presence of spindle-shaped fibroblasts and myofibroblasts, and a chronic inflammatory infiltrate composed of eosinophils, lymphocytes, and plasma cells. Also known as: IMT, inflammatory fibrosarcoma, inflammatory myofibroblastic neoplasm, inflammatory pseudotumor.