Intracranial (Sub)Arachnoid Cyst/Diverticulum
Focal cystic structures involving the components of the meninges are often referred to as arachnoid or subarchnoid cysts. It is debatable whether these abnormalities are present at birth or are acquired during postnatal development.
Age of Onset: Any age of animal can be affected
Sex Predisposition: Any sex of animal can be affected
Clinical Course:
Clinical signs may worsen over time
Clinical signs may worsen over time
Clinical Signs:
Clinical signs of nervous system dysfunction depend on which regions of the nervous system are involved.
Behavioral/Mental Awareness
Behavioral changes
Head pressing
Posture and Appearance
Skin abrasions on the dorsum of thoracic paws
Wide-based stance
Head tilt
Ventrolateral strabismus
Movement
Incoordination
Falling to the side
Varying degrees of proprioceptive ataxia
Tetraparesis
Head swaying
Paraparesis
Ataxia
Hypermetria
Rigid gait
Compulsive gait
Pleurothotonus
Hemiparesis
Circling
Intention tremor
Proprioception
Postural reactions delayed in all four limbs
Cranial Nerves
Menace deficits
Spinal Reflexes
Decreased in the thoracic limbs
Special Reflexes (e.g. cutaneous trunci)
Reduced oculocephalic reflexes
Positional vertical nystagmus
Special Functions (e.g. respiration; urination)
Central blindness
Pain Sensation
Neck pain
Other
Unable to walk on hard surfaces without protection booties
Focal seizure activity
Tonic-clonic seizures
Ventriculomegaly/hydrocephalus
Clinical signs of nervous system dysfunction depend on which regions of the nervous system are involved.
Behavioral/Mental Awareness
Behavioral changes
Head pressing
Posture and Appearance
Skin abrasions on the dorsum of thoracic paws
Wide-based stance
Head tilt
Ventrolateral strabismus
Movement
Incoordination
Falling to the side
Varying degrees of proprioceptive ataxia
Tetraparesis
Head swaying
Paraparesis
Ataxia
Hypermetria
Rigid gait
Compulsive gait
Pleurothotonus
Hemiparesis
Circling
Intention tremor
Proprioception
Postural reactions delayed in all four limbs
Cranial Nerves
Menace deficits
Spinal Reflexes
Decreased in the thoracic limbs
Special Reflexes (e.g. cutaneous trunci)
Reduced oculocephalic reflexes
Positional vertical nystagmus
Special Functions (e.g. respiration; urination)
Central blindness
Pain Sensation
Neck pain
Other
Unable to walk on hard surfaces without protection booties
Focal seizure activity
Tonic-clonic seizures
Ventriculomegaly/hydrocephalus
Typically found in or around the dorsal midbrain, third ventricular region (quadrigeminal cistern), rostral and dorsal to the cerebellum, or at the cerebellopontine angle.
Unknown
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