Intracranial intra-arachnoid cyst with intracystic hemorrhage in two dogs

Vet Radiol Ultrasound. 2002 Sep-Oct;43(5):449-54. doi: 10.1111/j.1740-8261.2002.tb01032.x.


Clinical signs, magnetic resonance imaging (MRI) features, treatment, and outcome of two adult dogs with neurologic dysfunction resulting from hemorrhage into a quadrigeminal intracranial intra-arachnoid cyst are described. In dog 1, the cyst was hyperintense to cerebrospinal fluid (CSF) on T1-weighted MRI and hypointense to CSF on T2-weighted images. In dog 2, the cyst was isointense to CSF on T1- and T2-weighted images. Both dogs were treated with craniotomy and cyst fenestration. A large blood clot was removed from the lumen of the cyst in each dog. Dog 1 is clinically normal 3.5 years post-surgery and has a persistent cyst. Dog 2 had a good initial response to therapy but was euthanized 2.5 years post-operatively due to generalized seizures. The late onset of clinical signs in these dogs most likely resulted from hemorrhage into the cyst. Surgical fenestration and hematoma removal appear to provide a satisfactory treatment for adult dogs with an intracranial intra-arachnoid cyst and intracystic hemorrhage. Persistence of the cyst may occur in some dogs.

Publication types

  • Case Reports

MeSH terms

  • Animals
  • Arachnoid Cysts / complications
  • Arachnoid Cysts / pathology
  • Arachnoid Cysts / veterinary*
  • Diagnosis, Differential
  • Dog Diseases / pathology*
  • Dog Diseases / surgery
  • Dogs
  • Intracranial Hemorrhages / complications
  • Intracranial Hemorrhages / pathology
  • Intracranial Hemorrhages / veterinary*
  • Magnetic Resonance Imaging / veterinary
  • Male
  • Paraparesis / etiology
  • Paraparesis / veterinary