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Imaging diagnosis: chronic unilateral trigeminal neuropathy masquerading as a trigeminal peripheral nerve tumour on MRI in a dog
  1. Mark Coia1,
  2. Julien Guevar1,
  3. Jacques Penderis2 and
  4. Gawain Hammond3
  1. 1School of Veterinary Medicine, University of Glasgow, Glasgow, UK
  2. 2University of Glasgow, School of Veterinary Medicine, Glasgow, UK
  3. 3Glasgow University, School of Veterinary Medicine, Glasgow, UK
  1. Correspondence to Gawain Hammond; gawain.hammond{at}


A seven-year-old crossbred dog presented with chronic, progressive left unilateral masticatory muscle atrophy. The neurolocalisation was to the left mandibular branch of the trigeminal nerve. MRI identified thickening of the left trigeminal nerve root, which was isointense to grey matter on T1-weighted and T2-weighted images and displayed contrast enhancement. The masticatory muscles (temporalis muscle) ipsilateral to the trigeminal neuropathy (left-sided) demonstrated contrast enhancement. Although a peripheral nerve sheath tumour was initially suspected, the lesion had largely resolved on repeated investigations after four months, supportive of a presumed diagnosis of trigeminal neuritis. Although unusual, unilateral trigeminal neuritis should be considered as a differential diagnosis, despite a progressive and chronic clinical course.

  • Trigeminal
  • Neuritis
  • Magnetic resonance imaging (MRI)
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  • Contributors Acquisition of data (clinical management of case, image interpretation and clinical follow-up): MC, GH, JG, JP. Drafting the article: MC. Review of article: GH, JG, JP. Formatting of article appropriate for submission: GH.

  • Competing interests None declared.

  • Provenance and peer review Not commissioned; externally peer reviewed.

  • Data sharing statement No additional data are available.

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