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).
While lesions may occur anywhere in the spine, reports in German Shepherd Dogs are most often reported in association with lumbosacral disease.
While lesions may occur anywhere in the spine, reports in German Shepherd Dogs are most often reported in association with lumbosacral disease.
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:
Behavioral/Mental Awareness
Reluctance to climb stairs
Vocalization
Movement
Paresis to paralysis
Ataxia
Difficulty rising
Shifting hindlimb lameness
Proprioception
Proprioceptive deficits
Muscle Atrophy
Atrophy of the hind limbs
Painful Reactions
Pain on palpation of lumbosacral junction
Pain on extension of the hip joints
Pain on dorsoflexion of the tail
Behavioral/Mental Awareness
Reluctance to climb stairs
Vocalization
Movement
Paresis to paralysis
Ataxia
Difficulty rising
Shifting hindlimb lameness
Proprioception
Proprioceptive deficits
Muscle Atrophy
Atrophy of the hind limbs
Painful Reactions
Pain on palpation of lumbosacral junction
Pain on extension of the hip joints
Pain on dorsoflexion of the tail
Spinal - Variable (Lumbosacral most commonly reported)
Unknown
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