Extradural Peripheral Nerve Sheath Tumour at T7 Level in a 2-Year-Old Dog

The aim of this report is to describe an unusual localization of nerve sheath tumour (NST), clinical presentation, imaging, surgical management, and outcome in a 2-year- old dog. A 2-year-old female American Staffordshire Terrier presented with non- ambulatory paraparesis, thoracolumbar hyperaesthesia, hindlimb hyperreflexia, and mild muscle atrophy. Computed tomography and magnetic resonance imaging revealed an extradural mass at T7-T8, without vertebral lesions. Surgical treatment consisted in resection of the soft tissue mass through dorsal laminectomy. The dog was ambulatory within 24hours and free of recurrence at 18 months postoperatively. Histopathologic and features of immunohistochemistry were consistent with NST. The NST of this report was similar to those described before, but exhibited unusual characteristics, such as being extradural, without extension into intervertebral forami- na, and being located in an atypical region (T7-T8). Moreover, survival time and relapse- free interval are greater than previously reported for similar cases.