Subacute paraplegia in a 6-year-old spayed female Basset Hound

A 6-year-old spayed female Basset Hound was presented for a 2-day history of subacute paraplegia.No trauma or injury was reported by the owners.Other pertinent medical history includes regional mastectomy due to mammary carcinoma 9 months prior.On neurological assessment, the dog was nonambulatory with an absence of proprioception and voluntary motor function, normal spinal reflexes, and conserved conscious pain sensation.Neurologic assessment of the forelimbs was normal.These findings were consistent with compressive or noncompressive myelopathy, localized in the T3-L3 spinal cord segment.Formulate differential diagnoses, then continue reading. Diagnostic Imaging Findings and InterpretationTo exclude gross pulmonary metastatic processes given the history of mammary carcinoma, right-toleft lateral thoracic radiography was performed.No pulmonary metastasis was seen, but expansile osteolytic lesions were observed in the extremities of the spinous processes of T2, T6, and T7 (Figures 1 and2).Considering the patient's history, the main hypothesis for multifocal expansile osteolytic thoracic vertebral lesions was bone metastases.However, bone metastases in the vertebral spinous processes are rare.The differential diagnoses included round cell tumor, enchondromatosis, multiple cartilaginous exostosis, giant cell tumor, bone abscesses, benign