Successful Treatment of Spinal Cord Drop Metastasis From a Forebrain Oligodendroglioma With Radiotherapy

A 7-year-old female neutered French Bulldog presented with left thoracic limb paresis. Twelve months earlier, the dog had been treated with 3D conformal radiotherapy for a right piriform lobe mass (suspected glioma), which had a strong partial response following treatment. Magnetic resonance imaging (MRI) revealed an intramedullary lesion of the cervical spinal cord, suspected to be drop metastasis. This lesion was treated with intensity-modulated radiotherapy (IMRT) (10 fractions of 3.6 Gy, total 36 Gy), with a response documented on MRI, alongside resolution of clinical signs. The dog died of unrelated causes 647 days following IMRT, and the diagnosis was confirmed at post-mortem examination.