We report here a case of an inflammatory myofibroblastic tumor in the retroperitoneum,\nwhich mimicked a germ cell tumor of the undescended testis. A 75-year-old\nhealthy man presented with a palpable abdominal mass. On the computed tomography\nimage, there was large, well-defined soft tissue mass in the left side of the retroperitoneum,\nand there was no visible left testis or seminal vesicle. After contrast enhancement,\nthe mass appeared to be relatively homogeneous, considering its large\nsize. With ultrasonography, it appeared as a well-defined, hypoechoic mass with\nintratumoral vascularity. This solid mass was surgically diagnosed as an inflammatory\nmyofibroblastic tumor.
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