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KMID : 1103720090610040257
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Journal of the Korean Society of Radiology
2009 Volume.61 No. 4 p.257 ~ p.262
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MR Imaging Features of Extraspinal Plasmacytoma of Bone
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Yu Mi-Hye
Hong Sung-Hwan
Choi Ja-Young
Myung Jae-Sung
Kim Su-Jin
Choi Jung-Ah
Kang Heung-Sik
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Abstract
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Purpose: To describe the MR imaging features of extraspinal plasmacytoma of the bone.
Materials and Methods: MR images of 10 lesions in 10 patients (3 men, 7 women; age range, 49-69 years) with extraspinal plasmacytoma of the bone were retrospectively reviewed. The bones involved included the pelvic bone (n = 7), humerus (n = 1), tibia (n = 1), and clavicle (n = 1). Signal intensity, contrast enhancement pattern, cortical bone abnormality, and surrounding bone marrow edema were analyzed.
Results: Compared to a muscle signal, the T1-weighted MR images showed either homogeneous high (n = 9) or iso (n = 1) signal intensity. The gadolinium-enhanced T1- weighted images showed homogeneous enhancement (n = 9), with only one huge plasmacytoma that has a central nonenhancing area. Cortical thinning and expansion was seen in all the lesions, while cortical penetration was apparent in 5 lesions. Also, in 5 lesions, serrated endosteal erosions were demonstrated. In all cases, perilesional bone marrow edema was not observed.
Conclusion: At MR imaging, extraspinal plasmacytoma of the bone has a characteristic homogeneous high signal intensity on a T1-weighted image. Other remarkable MR features include bone expansion with or without focal cortical penetration and serrated endosteal erosion.
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KEYWORD
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Plasmacytoma, Magnetic resonance (MR), Bone and bones
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