CyberKnife stereotactic radiosurgery for extramedullary plasmacytoma in the external auditory canal: illustrative case

This case concerns the use of stereotactic radiosurgery for recurrent extramedullary plasmacytoma in the eternal auditory canal of a 72-year-old male with a history of multiple myeloma. After initial conventional radiotherapy for the lesion, a recurrence was documented 7 years later. The stereotactic radiosurgery was successful and led to complete resolution of the lesion without long-term adverse effects or radiation-related complications over a 45-month period.