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BMJ Case Rep. 2009; 2009: bcr2007127134.
Published online Feb 16, 2009. doi:  10.1136/bcr.2007.127134
PMCID: PMC3106034
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An unusual cause of cord compression: synovial cyst of the thoracic spine
A Pratesi,1 A Ginestroni,1 R Padovani,2 and M Mascalchi1
1Radiodiagnostic Section, Department of Clinical Physiopathology, University of Florence, Florence, Italy
2Department of Neurosurgery, S Anna Hospital Ferrara, Italy
m.mascalchi/at/dfc.unifi.it
A 71-year-old man with chronic back pain had acute pain exacerbation, followed in the next month by progressive weakness of the right thigh. Neurological examination revealed myelopathy with a sensory level at T11. Spinal MRI (fig 1) revealed a well demarcated oval shaped lesion contiguous with the right T11–T12 facet joint causing dislocation and compression of the spinal cord that showed a subtle hyperintensity on T2 weighted images (TR/TE 3500/120). The lesion was inhomogeneously hyperintense on T1 weighted images (TR/TE 975/12) and hypointense on T2 weighted images and did not enhance after intravenous contrast medium. This appearance was consistent with a haemorrhagic spinal synovial cyst which was surgically removed with histological confirmation of the diagnosis and complete clinical recovery.
Figure 1
Figure 1
Sagittal MR images (A–C) show a well demarcated oval shaped lesion at T11–T12 (arrow) exhibiting inhomogeneous high signal intensity on the T1 weighted image (A), low signal intensity on the T2 weighted image (B) and no contrast enhancement (more ...)
The pathogenesis of spinal facet synovial cysts is not established but is assumed to result from a combination of microtraumas and degenerative changes.1 The cysts most commonly arise in the lumbar spine but can also occur in the cervical spine whereas their thoracic occurrence is very rare.2 Chronic inflammation and neovascularisation of the cyst walls explain the possible intracyst bleeding which is attributed to rupture of neoformed vessels, even in the absence of significant trauma. Intracyst bleeding can be massive or minor but repeated. Macrohaemorrhage produces a sudden increase in the size of the cyst with compression on the nearby structures, including the spinal cord, and acute exacerbation of clinical symptoms.3 In the case of microhaemorrhages, the compressive effect is usually moderate and can underlie a persistent subacute symptomatology.3 The MRI appearance of non-haemorrhagic spinal synovial cysts is rather non-specific with a low signal in T1 weighted images and high signal in T2 weighted images combined with a regular rim of peripheral contrast enhancement.4 Otherwise the MRI appearance of haemorrhagic spinal synovial cyst exhibiting hyperintensity on T1 weighted images and hypointensity on T2 weighted images reflecting the presence of haemoglobin byproducts is more characteristic5 and enables a differential diagnosis with other more common extramedullary lesions, including arachnoid cysts, perineural (Tarlov) cysts, neurinoma and meningioma.4
Acknowledgments
This article has been adapted from Pratesi A, Ginestroni A, Padovani R, Mascalchi M. An unusual cause of cord compression: synovial cyst of the thoracic spine Journal of Neurology, Neurosurgery and Psychiatry 2008;79:947
Footnotes
Competing interests: None.
Patient consent: Informed consent was obtained for publication of the case details described in this report.
REFERENCES
1. Marichal DA, Bertozzi JC, Rechtine G, et al. Case 101: lumbar facet synovial cyst. Radiology 2006;241:618–21. [PubMed]
2. Cohen-Gadol AA, White JB, Lynch JJ, et al. Synovial cysts of the thoracic spine. J Neurosurg Spine 2004;1:52–7. [PubMed]
3. Ramieri A, Domenicucci M, Seferi A, et al. Report of 3 cases. Lumbar hemorrhagic synovial cysts: diagnosis, pathogenesis, and treatment. Surg Neurol 2006;65:385–90. [PubMed]
4. Jackson DE, Atlas SW, Mani JR, et al. Intraspinal synovial cysts: MR imaging. Radiology 1989;170:527–30. [PubMed]
5. Petruzzi P, Mascalchi M. Spinal hemorrhagic synovial cyst: MR features of a case. Radiol Med 1996;92:815–17. [PubMed]
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