Removal of schwannoma from the psoas muscle with intraoperative neurophysiological monitoring: A case report.

Rationale: The incidence of a schwannoma within the psoas muscle is rare, and only a few cases have been reported. The surgical approach to removing schwannomas present in the psoas muscle is challenging because of its anatomical proximity to the lumbar plexus.

Patient Concerns: A 31-year-old man experienced right lower back pain and anterolateral thigh numbness for 2 months.