Removal of frontal meningioma by bilateral transfrontal approach in dog - Case study

Abstract

SUMMARY Background: Meningeoma is a common intracranial tumour type in dogs and cats. Epilepsy and obtunded mental state are the most common clinical signs of frontal meningiomas. Frontal lobe and olfactory bulb are the most typical place of meningioma in dogs. Many surgical procedures have been described about the removal of meningioma which depends on the placement of the tumour. Bilateral transfrontal approach is recommended in case when the meningioma locates at the frontal lobe. Followed by the tumour resection chemotherapy and/or radiotherapy are recommended.Materials and Methods, Results and Discussion: A 10-year-old Hungarian Vizsla was referred for examination to FeliCaVet Vet Clinic due to seizures and obtunded mental state. Neurological examination did not show any severe abnormalities except moderate obtundation. Preoperative examination, included blood and urine tests, abdominal- and heart ultrasound, chest radiography, were normal. Magnetic resonance imaging (MRI) examination of the head revealed a 15×20 mm T2W hyperintense lesion in the right frontal lobe with “dural sign” and perilesional oedema. Bilateral transfrontal approach was performed to remove the right olfactory bulb, the neoplastic lesion and a small affected part of the right frontal lobe. After the surgery two seizures were observed during the 2 days of hospitalization. Levetiracetam was started to eliminate the postoperative seizure activity. 1 week later the first control MRI examination showed that the right olfactory bulb was completely removed together with the majority of the tumorous tissue and a small part from frontal lobe. 2 months after the surgery a second follow-up MRI examination was performed which revealed the same result as the first MRI. From the second day of the surgery the dog is fine and all the previously noted clinical signs have disappeared. 3 weeks after the surgery chemotherapy was started with hydroxyurea which is currently still ongoing