• J Magn Reson Imaging · Nov 2008

    Comparative Study

    Ability of diffusion-weighted imaging for the differential diagnosis between chronic expanding hematomas and malignant soft tissue tumors.

    • Kiyoshi Oka, Toshitake Yakushiji, Hiro Sato, Shigeta Yorimitsu, Yoshiko Hayashida, Yasuyuki Yamashita, and Hiroshi Mizuta.
    • Department of Orthopaedic and Neuro-Musculoskeletal Surgery, Faculty of Medical and Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan. okaokay5888@yahoo.co.jp
    • J Magn Reson Imaging. 2008 Nov 1; 28 (5): 1195-200.

    PurposeTo evaluate the potential of diffusion-weighted imaging (DWI) in distinguishing chronic expanding hematomas (CEHs) from malignant soft tissue tumors.Materials And MethodsWe performed conventional MRI and DWI of six CEHs and 31 malignant soft tissue tumors from 37 patients seen between May 2000 and November 2006. DWI was obtained with a single-shot echo-planar imaging (EPI) sequence using a 1.5T MR imager. The mean apparent diffusion coefficient (ADC) value was also calculated. We evaluated MRI findings of CEHs and compared ADC value of CEHs with malignant soft tissue tumors.ResultsOn conventional MRI, two of six CEHs were difficult to differentiate from malignant soft tissue tumors based on imaging findings. The mean ADC value of CEHs and malignant soft tissue tumors was 1.55+/-0.121x10(-3) mm2/sec and 0.92+/-0.139x10(-3) mm2/sec (mean+/-SD), respectively. The mean ADC value of CEHs was significantly higher than that of malignant soft tissue tumors (P<0.01). There was no overlap in the minimum ADC values among CEHs and malignant soft tissue tumors.ConclusionDWI is useful for differentiating between CEHs and malignant soft tissue tumors.Copyright (c) 2008 Wiley-Liss, Inc.

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