Inflammatory Myofibroblastic Tumor Mimicking Invasive Thymoma: A Case Report

Inflammatory myofibroblastic tumor is an unusual disease that is most commonly seen in the lung and orbit and extremely rare in the mediastinum. As far as we know, there have been only two case reports of mediastinal inflammatory myofibroblastic tumor occurring in patients over 40 years old. In literature, we found no such case of mediastinal inflammatory myofibroblastic tumor that can present as invasive thymoma on the basis of the image pattern. Here, we report 57-year-old woman with anterior mediastinal inflammatory myofibroblastic tumor, which shows local invasion to the pericardium and central necrosis on chest CT scan. These uncommon image patterns have not been documented in literature and present diagnostic challenges.