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
Focal and/or generalized seizures
Posture and Appearance
Skin abrasions on the dorsum of thoracic paws
Wide-based stance
Head tilt
Movement
Ataxia
Falling to the side
Paraparesis to Tetraparesis
Head swaying
Hypermetria
Paresis
Circling
Intention tremor
Proprioception
Proprioceptive deficits
Cranial Nerves
Menace deficits
Facial paralysis
Trigeminal deficits
Pain Sensation
May have pain on palpation of the cervical vertebral column
Clinical signs of nervous system dysfunction depend on which regions of the nervous system are involved.
Behavioral/Mental Awareness
Behavioral changes
Head pressing
Focal and/or generalized seizures
Posture and Appearance
Skin abrasions on the dorsum of thoracic paws
Wide-based stance
Head tilt
Movement
Ataxia
Falling to the side
Paraparesis to Tetraparesis
Head swaying
Hypermetria
Paresis
Circling
Intention tremor
Proprioception
Proprioceptive deficits
Cranial Nerves
Menace deficits
Facial paralysis
Trigeminal deficits
Pain Sensation
May have pain on palpation of the cervical vertebral column
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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