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  • Title: Far lateral extraforaminal lumbar synovial cyst: report of two cases.
    Author: Phuong LK, Atkinson JL, Thielen KR.
    Journal: Neurosurgery; 2002 Aug; 51(2):505-7; discussion 507-8. PubMed ID: 12182792.
    Abstract:
    OBJECTIVE AND IMPORTANCE: We present two cases of a far lateral extraforaminal synovial cyst at the L5-S1 level of the spine. Neither case was diagnosed as a synovial cyst before surgery because of their atypical location. Only one other case of an extraforaminal synovial cyst, located at L4-L5, has been reported in the literature. CLINICAL PRESENTATION: Both women presented with radicular leg pain and examination findings consistent with L5 root compression. INTERVENTION: During surgery, the cyst was not associated with the facet joint. One cyst was adherent to the nerve root. Both cysts were completely resected, with excellent pain relief. CONCLUSION: These cases serve as a stimulus to look outside the spinal canal and foramen in patients with symptoms suggesting nerve root compression. Far lateral extraforaminal synovial cyst should be included in the differential diagnosis.
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