Objective:The aim
of this study is to report a case of arachnoid cyst due to mass effect on the
thoracic marrow.Observation:A
15-year-old patient was admitted to our institution and complaining of high
back pain. Three months before he developed progressive and occasional back
pain with thoracic irradiation in hemi-belt, increased by the dorsal decubitus.
Neurological examination revealed a spasmodic paraplegia. The muscular strength was
quoted as 2 to the left and 3 to the right on a scale of 5. Magnetic resonance
imaging (MRI) revealed and extradural cyst located to the dorsal spinal cord.
The ablation of a voluminous translucent cyst was achieved after a vast
decompressive laminectomy from the sixth to the eighth thoracic vertebra. The
dural communication with the cyst was stitched. After surgery, the pain has
disappeared and the neurological recovery was progressive over a period of 21
days. The diagnosis of arachnoid cyst was confirmed by histological
examination.Conclusion:The
extradural thoracic arachnoid cyst is a rare affection of good forecast. In the
symptomatic form, the surgery as soon as possible remains the solution. The MRI
keeps all its interest for the diagnostic orientation and the therapeutic
strategy.
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