A case of solitary bone plasmacytoma to multiple myeloma: a case report

Solitary bone plasmacytoma of the rib is uncommon but recognized. We report a case presenting with recurrent, predominantly nocturnal chest wall pain. Imaging revealed an expansile lesion on the left ninth rib and initially suggested fibrous/osteofibrous dysplasia. The patient underwent resection of the involved rib segment. Histopathology and immunohistochemistry confirmed solitary bone plasmacytoma. The patient declined the recommended adjuvant radiotherapy. Twenty-one months later, the disease progressed to multiple myeloma.