Abstract
A 9-year-old male neutered mixed breed dog had a two-month history of progressive left thoracic limb lameness. There was electromyographic evidence of denervation potentials in all muscles of this limb. In magnetic resonance images a multilobulated, hyperintense mass was visible caudal to the middiaphysis of the left humerus on T-2 weighted images. The mass, which was isointense with surrounding tissue on T1 weighted images, extended proximally towards the brachial plexus. The mass was also visible as a fusiform structure of mixed echogenicity sonographically, although fine-needle aspiration performed at this time was nondiagnostic. A malignant peripheral nerve sheath tumor was diagnosed histopathologically.
MeSH terms
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Action Potentials / physiology
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Animals
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Biopsy, Needle / veterinary
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Brachial Plexus / diagnostic imaging
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Brachial Plexus / pathology*
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Dog Diseases / diagnosis*
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Dog Diseases / diagnostic imaging
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Dogs
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Electromyography / veterinary
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Forelimb / innervation*
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Humerus / innervation
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Lameness, Animal / diagnosis
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Lameness, Animal / diagnostic imaging
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Magnetic Resonance Imaging / veterinary*
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Male
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Muscle, Skeletal / innervation
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Nerve Sheath Neoplasms / diagnosis
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Nerve Sheath Neoplasms / diagnostic imaging
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Nerve Sheath Neoplasms / veterinary*
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Orchiectomy / veterinary
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Peripheral Nervous System Neoplasms / diagnosis
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Peripheral Nervous System Neoplasms / diagnostic imaging
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Peripheral Nervous System Neoplasms / veterinary*
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Ultrasonography