Background: Spontaneous psoas hematoma is a very rare clinical entity, and the pathogenesis and pathologic mechanisms of spontaneous psoas hematoma remain unclear, thus, it is of great value to explore.
Case Presentation: We encountered a patient who developed femoral nerve paralysis due to psoas muscle hematoma following posterior lumbar fusion surgery. A 69-year-old female with lumbar spinal canal stenosis underwent posterior lumbar fusion at the L3-4 and L4-5 levels. On the 7th postoperative day, the patient complained of severe abdominal pain along with right limb pain and weakness. A computed tomography image showed a large acute psoas muscle hematoma on the right side. After conservative treatment, the psoas hematoma was resolved and the patient's femoral nerve paralysis gradually recovered.
Conclusions: Spontaneous psoas hematoma is a rare and extremely dangerous complication after lumbar spine surgery. For high - risk patients who have taken anticoagulants before the operation, we must be vigilant against the occurrence of this complication.
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