Extradural Synovial Cyst
Some animals may have congenital bony malformations of the articular facets predisposing to a stenotic vertebral canal associated with bony compression of the spinal cord. In still other instances, small portions of synovial tissue containing synovial fluid may become entrapped and "pinched off." These sacs of inspissated synovial fluid are known as synovial cysts. These cysts may compress the spinal cord, either statically or with vertebral movement (dynamic compression).
Age of Onset: Any age of animal can be affected
Sex Predisposition: Any sex of animal can be affected
Clinical Course:
Variable - dogs may be asymptomatic or signs may progressively worsen depending on the size and growth of the cyst.
Variable - dogs may be asymptomatic or signs may progressively worsen depending on the size and growth of the cyst.
Clinical Signs:
Movement
Paresis to paralysis
Ataxia
Difficulty rising
Shifting hindlimb lameness
Proprioception
Proprioceptive deficits
Spinal Reflexes:
Can be normal or increased/decreased depending on the location of the lesion and the degree of spinal cord involvement
Painful Reactions
May have pain on palpation of the vertebral column over the affected area
Movement
Paresis to paralysis
Ataxia
Difficulty rising
Shifting hindlimb lameness
Proprioception
Proprioceptive deficits
Spinal Reflexes:
Can be normal or increased/decreased depending on the location of the lesion and the degree of spinal cord involvement
Painful Reactions
May have pain on palpation of the vertebral column over the affected area
Spinal - Variable
Unknown
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