Clinical and MRI Findings in Three Dogs with Polycystic Meningiomas

James, Fiona; Costa, Ronaldo C. da; Fauber, Amy E.; Peregrine, Andrew S.; McEwen, Beverly; Parent, J; Bergman, Robert L.

doi:10.5326/jaaha-ms-5774

Cited by 15 publications

(20 citation statements)

References 24 publications

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“…The most common sites of intracranial cysts in animals include the fourth ventricle and cerebellopontine angle (2, 6, 8, 10, 12, 14–16) and the area above the quadrigeminal plate (4–7, 9). There are individual reports of cysts located in the brainstem (6, 9, 11, 13); cerebellum (3); and frontal (11), diencephalic (1), and hypophyseal (31) regions. Lesions involving the cerebellar, medullary, and fourth ventricular regions can be best approached from the caudal direction (suboccipital approach, e.g., cystoperitoneal shunting).…”

Section: Discussionmentioning

confidence: 99%

“…Other reports involve a brainstem arachnoid cyst in the pontomedullary region that caused unilateral facial paresis in an 8-years-old female Maltese dog (9) and a caudal fossa respiratory epithelial cyst in the fourth ventricle that caused bilateral vestibular syndrome in an 11-months-old female Bloodhound (10). Meningioma is also a common intracranial tumor in dogs, although cystic meningioma is rare and has been described in only one study involving three dogs (11). Epidermoid cysts are true and rare cysts involving the central nervous system of dogs.…”

Section: Introductionmentioning

confidence: 99%

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A Recurrent Suprapituitary Ependymal Cyst Managed by Endoscopy-Assisted Transsphenoidal Surgery in a Canine: A Case Report

Lehner

Garamvölgyi

Jakab³

et al. 2019

Front. Vet. Sci.

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A 9-years-old spayed female mixed-breed dog was referred for the evaluation of intermittent head tremors, obtundation, long-standing blindness, and a tendency to seek confined spaces. The dog lost its vision 6 months before the current presentation. A menace response was absent on ophthalmological examination. Neurological examination did not show any abnormalities. A cyst measuring 16 × 18 × 14 mm was observed above the pituitary gland on magnetic resonance imaging. It extended toward the frontal area and compressed the optic chiasm and hypothalamic regions. A minimum preoperative database, including the findings of other required blood tests, was prepared. No abnormal laboratory findings were observed. Endoscopy-assisted transsphenoidal hypophysectomy was performed to remove the pituitary gland, drain the cyst, and partially excise the cyst wall. Normal pituitary gland tissue was observed on histopathology, and the mass was found to have a neuroendocrine or ependymal origin on cytology. Strict post-operative laboratory tests were performed at 1-h intervals for 24 h. An empty sella turcica region, and a collapsed and empty cyst wall was observed on follow-up magnetic resonance imaging. After 3 days of observation, the dog was discharged with a prescription of substitution therapy. However, the dog presented with the same signs and symptoms 73 days after the surgery. Cyst recurrence was apparent on magnetic resonance imaging. The owner requested euthanasia, and an ependymal cyst was observed on necropsy. To the best of our knowledge, we present the first case of an intra- and suprasellar ependymal cyst, and its surgical management in a canine. The findings from this case suggest that endoscopic transsphenoidal drainage and hypophysectomy could be a good surgical approach in cases where involvement of the pituitary gland is confirmed or strongly suspected on the basis of cytological and imaging findings.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Recurrent Suprapituitary Ependymal Cyst Managed by Endoscopy-Assisted Transsphenoidal Surgery in a Canine: A Case Report

Lehner

Garamvölgyi

Jakab³

et al. 2019

Front. Vet. Sci.

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“…Although it is widely accepted that pain can result in animals displaying aggressive behaviour to avoid physical contact,11 little is known about the timeline of this occurring. Behavioural changes can precede other clinical signs of disease by weeks or months,12 and onset of or an increase in aggressive responses has been reported in cases later on diagnosed with polycystic and microcystic meningiomas 13 14. Spinal meningiomas have been reported with general signs of discomfort such as restlessness and irritability, preceding the signs of limping and lameness on an average of 5.8 months 15.…”

Section: Discussionmentioning

confidence: 99%

Human‐directed aggressive behaviour as the main presenting sign in dogs subsequently diagnosed with diskospondylitis

Affenzeller

McPeake

McClement³

et al. 2017

Vet Record Case Reports

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2 case reports - human directed aggression in dogs later found to have discospondylitis.\ud Abstract: This is the first report of aggressive behaviour as the primary presenting sign in two dogs subsequently found to have chronic diskospondylitis, with neither dog showing other typical clinical signs of this condition. Mild signs of pain were elicited on physical examination in both dogs. Further medical investigation revealed signs indicative of chronic diskospondylitis (L7/S1) and treatment with analgesics and antibiotics was commenced. A marked improvement in behaviour was seen in both dogs when on treatment. Dog 1 stopped exhibiting unpredictable episodes of growling and biting when handled or approached and dog 2 stopped vocalising and occasional growling when handled or lifted. Gradual treatment withdrawal (dog 1 after six weeks and dog 2 after four weeks, respectively) caused a recurrence of behaviour signs thus further treatment was recommenced. Continued follow-up over a year revealed the importance of long-term use of analgesics to prevent behavioural deterioration when chronic lesions are present

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“…Specifically, subarachnoid diverticula are areas of focal accumulations of fluid with MRI characteristics similar to cerebrospinal fluid within the subarachnoid space, and are often incorrectly referred to as cysts . Likewise, neoplasms, such as meningioma, may contain a single fluid‐filled structure or be composed of multiple fluid‐filled loculations that incorrectly characterises the pathology as a cystic meningioma . So too, parasitic cysts may appear as a fluid‐filled structure but are not a true cyst .…”

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confidence: 99%