This study was aimed to investigate the clinical features of multiple myeloma (MM) complicated by spinal infiltration (extramedullary plasmacytoma) so as to enhance the understanding of this kind of MM and reduce the missed diagnosis for these MM patients. 10 patients with MM complicated by spinal infiltration were enrolled in this study. Bone marrow, blood, hepatic and renal function, electrolyte, beta2 microglobulin, C-reactive protein and immunoglobulin (M-protein) were detected. The involved spinal sites were examined by using magnetic resonance imaging (MRI) or computerized tomography (CT). 10 patients were staged according to International Stage System (ISS) and Duric-Salmon stage system. The clinical data of patients were analyzed. The results showed that among 10 cases of MM complicated by spinal infiltration, involved pectoral cord was observed in 7 cases, involved lumbar cord in 2 cases and sacral cord in 1 case. The treatment with operation and protocol containing cisplatin, ifosfamide etoposide, prednisone, and bortezomib in combination with other drugs indicated that the total remission rate was 80% (8/10), no serious adverse responses was observed. In conclusion, the patients with MM complicated by spinal infiltration must be diagnosed and treated as early as possible. Once paraplegia happened in patients, the therapeutic efficacy and prognosis would be very poor.
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