Probable trigeminal nerve schwannoma in a dog.
A 7-year-old male Husky dog developed atrophy of the right masseter muscle and pruritus of the right side of the face. A myogenic origin was excluded using muscular biopsy. Electrophysiologically, there was involvement of the motor and sensory fibers of the trigeminal nerve, suggesting a lesion located between the brainstem and the trigeminal ganglion. On MRI examination, a nodular mass was detected in the right caudal fossa. This mass was characterized by intense enhancement after injection of contrast medium. Because of the progressive clinical signs, electrophysiology, and MRI results, a presumptive diagnosis of a trigeminal nerve schwannoma was made. The animal's condition improved slightly with corticosteroids. The dog underwent euthanasia 3 months after initial presentation. Necropsy was not performed.
Saunders
J H
JH
Department of Medical Imaging, Faculty of Veterinary Medicine, University of Liège, Belgium.
Poncelet
L
L
Clercx
C
C
Snaps
F R
FR
Flandroy
P
P
Capasso
P
P
Dondelinger
R F
RF
D000818:Animals; D001284:Atrophy; D001706:Biopsy / Q000662:veterinary; D001932:Brain Neoplasms / Q000175:diagnosis / Q000662:veterinary; D003287:Contrast Media; D003390:Cranial Nerve Neoplasms / Q000175:diagnosis / Q000662:veterinary*; D004283:Dog Diseases / Q000175:diagnosis*; D004285:Dogs; D004568:Electrodiagnosis / Q000662:veterinary; D005682:Gadolinium; D005938:Glucocorticoids / Q000627:therapeutic use; D007089:Image Enhancement; D008279:Magnetic Resonance Imaging / Q000662:veterinary*; D008297:Male; D008406:Masseter Muscle / Q000473:pathology; D008536:Meglumine / Q000008:administration & dosage; D009442:Neurilemmoma / Q000175:diagnosis / Q000662:veterinary*; D009942:Organometallic Compounds / Q000008:administration & dosage; D011239:Prednisolone / Q000627:therapeutic use; D011537:Pruritus / Q000662:veterinary; D012668:Trigeminal Ganglion / Q000473:pathology; D014276:Trigeminal Nerve / Q000473:pathology*
D003287:Contrast Media; D005938:Glucocorticoids; D009942:Organometallic Compounds; D008536:Meglumine; D011239:Prednisolone; D005682:Gadolinium; C072417:gadoterate meglumine