J Korean Soc Radiol.  2009 Oct;61(4):257-262. 10.3348/jksr.2009.61.4.257.

MR Imaging Features of Extraspinal Plasmacytoma of Bone

• Yu MH
• Hong SH
• Choi JY
• Myung JS
• Kim SJ
• Choi JA
• Kang HS

• KMID: 2209025
• DOI: http://doi.org/10.3348/jksr.2009.61.4.257

Abstract

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.

MeSH Terms

Bone and Bones
Bone Marrow
Clavicle
Edema
Humans
Humerus
Male
Muscles
Pelvic Bones
Plasmacytoma
Retrospective Studies
Tibia