Whether inflammatory myofibroblastic tumor of the thigh relapses after surgical excision?

As reported previously, the 61-year-old male Chinese patient suffering from the inflammatory myofibroblastic tumor of the right thigh without bone involvement was performed a surgical excision and a local radiotherapy two years ago. However, a moderately soft and painful 200 × 100 mm mass of the posterior thigh, where magnetic resonance imaging (MRI) scans revealed an inhomogeneously hyperintense on T1-weighted imaging (T1WI), T2-weighted imaging (T2WI) and diffusion-weighted imaging (DWI), was found forty days after the operation. Two years into follow-up, we intend to judge whether the tumor relapses by regular imaging examination including thoracic computed tomography (CT) scans and local MRI scans of lower extremities. The diagnosis of postoperative cyst is suggested.