"Inflammatory myofibroblastic tumours are a heterogeneous group of oncogene-driven low-grade sarcomas composed of myofibroblastic and fibroblastic spindle cells, along with inflammatory cells, including lymphocytes and eosinophils. Kinase fusions are reported in"
"Inflammatory myofibroblastic tumours typically appear as well-defined or less-well demarcated smooth or multilobulated masses with variable imaging features depending on the balance of inflammatory infiltrate and stroma 14. A minority may show calcifications (more common in the head and neck), and enhancement is often heterogeneous due to mixed cellular, myxoid and stromal elements 14."