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Magnetic Resonance Imaging and Ultrasonography in the Diagnosis of a Malignant Peripheral Nerve Sheath Tumor in a Dog

Platt S.R., Graham J., Chrisman C.L., et al.

Vet Radiol Ultrasound, 1999. 40(4): p.367-71.

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.