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Solitary plasmacytoma of the bone is a rare neoplasm characterized by proliferation of neoplastic plasma cells in the bone in the absence of systemic involvement. We present a managed case of a 64-year-old male with solitary bone plasmacytoma of the right proximal femur, who presented as a pathological subtrochanteric femur fracture.Case Report: A 64-year-old male presented to our outpatient department with pain in the right hip and restricted range of motion following a trivial trauma. The radiographs showed an osteolytic lesion in the right proximal femur with a right subtrochanteric femur fracture. A magnetic resonance imaging scan revealed a well-defined lesion in the right proximal femur. A 18F-fluorodeoxyglucose positron emission tomography did not show a lesion at any other site suggesting that the lesion was solitary. A serum protein electrophoresis study was normal and the urine was negative for myeloma protein. The patient had a score of 12 as per Mirel’s criteria and hence required operative intervention and fixation. The patient was managed with a thorough mechanical and chemical curettage of the lesion followed by fixation with a proximal femur locking plate and augmentation with fibula and iliac crest bone graft. He was then given a chemotherapy regimen consisting of nine cycles of bortezomib, lenalidomide, and dexamethasone.Conclusion: Solitary bone plasmacytoma is a rare neoplasm of the bone. Early diagnosis and intervention are required to manage it and prevent its progression to multiple myeloma, which is a more aggressive entity and lies at the other end of the spectrum of plasma cell dyscrasias. Management of this lesion requires an active participation of the hematologist and a holistic approach which includes radiotherapy or surgery with possible adjuvant chemotherapy.Keywords: Solitary bone plasmacytoma, subtrochanteric femur fracture, multiple myeloma, bortezomib, lenalidomide, dexamethasone.

Rare Case of a Solitary Bone Plasmacytoma of the Proximal Femur Managed with Surgery and Adjuvant Chemotherapy: A Case Report