Single-stage 360° Reconstruction in a Case of Solitary Vertebral Plasmacytoma of L3 vertebra – A Case Report

INTRODUCTION: Malignant bone tumors of the spine are extremely rare with an incidence of 0.05% of primary neoplasms. Solitary plasmacytoma of the vertebra accounts for about 30% of the total within this group. CASE PRESENTATION: A 23-year-old female presented to spine clinic, with complaints of low back pain, deformity in lower back, and difficulty in walking for 3 months duration. Radiological investigations revealed destruction of L3 vertebra with soft-tissue mass around it. USG-guided biopsy from the lesion was suggestive of plasma cell dyscrasia. Routine blood investigations showed no abnormality. Urine myeloma profile and immunoelectrophoresis were done which were within normal limit and ruled out multiple myeloma. Due to the profound neurological deficit and existing instability, the patient underwent decompression, resection of tumor, anterior column reconstruction with cage, and instrumented posterior and posterolateral fusion (360° fusion) from L1-L5, before radiotherapy. The patient was subjected to 23 cycles of intensity-modulated radiotherapy and is doing good on subsequent follow-ups with good fusion. CONCLUSION: Solitary plasmacytoma of vertebra when associated with neurological deficit and/or instability should be treated with spinal stabilization surgery followed by radiotherapy to achieve good and overall predictable outcomes.