... perineurioma of theretroperitoneum in a 63 -year- old man, computed tomography andmagnetic resonance imaging findings: a case report. Journal of Medical Case Reports 2010 4:290.Yasumoto et al. ... details1Departments of Radiology, Saitama Red Cross Hospital, 8-3-33, Kamiochiai,Chuo-ku, Saitama, Saitama, Japan.2Department of Pathology Saitama RedCross Hospital, 8-3-33, Kamiochiai, Chuo-ku, Saitama, ... histiocytoma with myxoid change, andlow-grade fibromyxoid sarcoma.Dynamic MR imaging better provides the graduallyenhancing nature of a myxoid tumor. Soft-tissue peri-neuriomas with marked myxoid...