Hemorrhagic cervical juxta-facet cyst presenting with Brown-Séquard syndrome: illustrative case.

Background: Intraspinal juxta-facet cysts of the spine are known to predominate at the lumbar level and is relatively rare at the cervical level. Most cervical spinal lesions are found incidentally, but they sometimes cause myelopathy or radiculopathy in a chronic course.

Observations: The authors present a rare case of hemorrhagic cervical juxta-facet cyst presenting with Brown-Séquard syndrome. An 86-year-old woman presented with acute-onset right hemiparesis following neck pain and was admitted to the local hospital. She was started on antithrombotic therapy with a suspected diagnosis of cerebral infarction, but quadriplegia progressed 2 days later. Cervical magnetic resonance imaging revealed an intraspinal mass at the C4-5 level and she was referred to the authors' hospital. Her neurological findings on admission revealed right Brown-Séquard syndrome. In emergency surgery, the mass was resected with a posterior approach. Pathological findings showed hemosiderin deposition and fibroblast proliferation, consistent with a juxta-facet cyst with intracystic hemorrhage. The patient recovered well and returned to an independent daily life.

Lessons: Rarely, juxta-facet cyst of the cervical spine can cause acute Brown-Séquard syndrome due to intraspinal hemorrhage. In a case of hemiparesis that develops following neck pain, hemorrhagic cervical juxta-facet cyst should be taken into consideration as a differentiation.