Multiple myeloma with pathologically proven skull plasmacytoma after a mild head injury: Case report

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MM is a malignant tumor originating from the plasma cells of the bone marrow. Central nervous system myelomatosis is very rare and may be a complication of MM.

Patient concerns:

A 60-year-old man presented with a slowly growing soft mass at his right frontal scalp after a mild head injury 6 months ago.


Neuroradiological examinations revealed a solid intracranial-extracranial mass with an osteolytic lesion in the skull. Histopathological examination showed skull plasmacytoma, and postoperative examinations revealed multiple myeloma.


The tumor was completely removed and the skull defect repaired with the titanium mesh. Then, chemotherapy was initiated after surgery with bortezomib and dexamethasone.


The patient received eight chemotherapies within one year after surgery.


Despite a history of head injury, a differential diagnosis should be kept in mind during the diagnosis of solid intracranial-extracranial masses, especially in the presence of osteolytic skull at the lesioned site.

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