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J Korean Radiol Soc. 2002 Sep;47(3):313-316. English. Case Report.
Kim YS , Jeon HJ .
Department of Diagnostic Radiology, College of Medicine, Chosun University, Korea.
Department of Pathology, College of Medicine, Chosun University, Korea.

We report a case of proliferative myositis arising in the pectoralis major muscle of a 59-year-old man who presented with palpable mass. The initial clinical impression was a malignant tumor. Ultrasonography revealed the lesion as a spindle-shaped hypoechoic mass, and MR imaging of the left pectoralis major muscle showed hypointensity at T1-weighted imaging, hyperintensity at T2-weighted imaging, and strong enhancement at contrast-enhanced T1-weighted imaging.

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