Conclusion
Renal inflammatory myofibroblastic tumor (IMT) is extremely rare, when it occurs in children, it is difficult to distinguish from nephroblastoma both clinically and radiologically, and the final diagnosis and differential diagnosis rely on pathology and immunohistochemistry. The analysis of their reliable imaging characteristics is of great importance to determine the appropriate diagnosis and patient management to avoid excessive treatment. In addition, IMT should be considered as a differential diagnosis when presented as a large renal mass in children with pain and fever. Furthermore, the features of MRI signal could probably predict pathological classifcation in a certain sense.