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• Clinical Article •
Value of fat suppression techniques in the MR imaging diagnosis of polymyositis and dermatomyositis
ZHANG Ke-bei  HUA Jia  ZOU Ai-hua  GU Hai-yan  LIU Xiao-sheng  LIN Zhi-qian  LU Qing  XU Jian-rong 

DOI:10.3969/j.issn.1674-8034.2011.02.005.


[Abstract] Objective: To discuss the application value of fat suppression techniques in the MRI diagnosis of polymyositis and dermatomyositis.Materials and Methods: The MRI appearances of the bilateral thighs in 46 patients with polymyositis or dermatomyositis were reviewed, using T1W, T2W and fat suppression sequences (short time inversion recovery or spectral presaturation with inversion recovery). The abilities of detecting lesions among T1W, T2W and fat suppression sequences were observed and compared.Results: (1) Abnormalities in the MRI appearances of bilateral thighs were found in 43 cases, which representing myositis in 33 cases, fasciitis in 40 cases , subcutaneous inflammation in 20 cases, marrow edema in 13 cases and myoatrophy in 5 cases. (2) All the abnormalities mentioned above were discovered in fat suppression sequences except myoatrophy. There were 12 cases of subcutaneous inflammation, and 5 cases of marrow edema to be found on T1W, however, no cases of myositis or fasciitis were displayed obviously. There were 10 cases of myositis and 5 cases of myoatrophy to be found, on T2W,however, fasciitis, inflammation in subcutaneous connective tissues and marrow edema were failed to be displayed. (3) Twelve cases with subcutaneous inflammation and 5 cases with marrow edema were observed on T1W, 10 cases with myositis observed in T2W, were all at the acute or subacute stage at that time. Five cases with myoatrophy observed in both T1W and T2W were all at the chronic stage. Three cases with slight myositise and 10 cases with slight fasciitis were observed only in the fat suppression sequences among the patients at the chronic stage, all of which were failed to be observed in T1W and T2W.Conclusion The application of MR fat suppression techniques can help to increase the detection of inflammatory lesions in soft tissues obviously . The fat suppression sequences are prefered when proceeding the MRI exam for polymyositis and dermatomyositis.
[Keywords] Magnetic resonance imaging；Polymyositis；Dermatomyositis；Fasciitis；Fat suppression；Short time inversion recovery；Spectral presaturation with inversion recovery

ZHANG Ke-bei Department of Radiology, Renji Hospital, Medical College of Shanghai Jiao Tong University, Shanghai 200001, China

HUA Jia Department of Radiology, Renji Hospital, Medical College of Shanghai Jiao Tong University, Shanghai 200001, China

ZOU Ai-hua Department of Radiology, Renji Hospital, Medical College of Shanghai Jiao Tong University, Shanghai 200001, China

GU Hai-yan Department of Radiology, Renji Hospital, Medical College of Shanghai Jiao Tong University, Shanghai 200001, China

LIU Xiao-sheng Department of Radiology, Renji Hospital, Medical College of Shanghai Jiao Tong University, Shanghai 200001, China

LIN Zhi-qian Department of Radiology, Renji Hospital, Medical College of Shanghai Jiao Tong University, Shanghai 200001, China

LU Qing Department of Radiology, Renji Hospital, Medical College of Shanghai Jiao Tong University, Shanghai 200001, China

XU Jian-rong* Department of Radiology, Renji Hospital, Medical College of Shanghai Jiao Tong University, Shanghai 200001, China

*Correspondence to: Xu JR, E-mail: xujianr@hotmail.com

Conflicts of interest   None.

Received  2010-12-20
Accepted  2011-02-06
DOI: 10.3969/j.issn.1674-8034.2011.02.005
DOI:10.3969/j.issn.1674-8034.2011.02.005.

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