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MRI of the hip region with metal artifact reduction protocol. A coronal STIR
sequence image showing 7.7 cm x 5 cm hyper-intense mass adjacent to the
greater trochanter of left femur.
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Repeat MRI of hip region with metal artifact reduction protocol revealed a 7.7 cm x 5.0 cm intramuscular mass abutting left hip prosthesis adjacent to greater trochanter (Figure 1).
Muscle biopsy with H&E stain (40x) showing plasma cell neoplasm (white
arrow).
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Immunohistochemistry positive for CD138 confirmed the presence of plasma cells (Figure 2).
Contrast-enhanced axial T1-weighted MRI image of hip region showing a
reduction is tumor mass (3.3 cm x 2.3 cm).
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After 4 weeks, his leg weakness improved along with significant reduction in tumor mass (3.3 cm x 2 cm) on follow-up MRI (Figure 3).