Posterior mediastinal paraganglioma involving the spinal cord of a dog

A posterior mediastinal paraganglioma is described in a five-year-old female collie showing paralysis of the hindlimbs. The mass was observed radiographically and a myelogram confirmed a spinal cord compression at the thoracic level. Histological examination of the mass diagnoses a paraganglioma which was confirmed by histochemical and immunohistochemical studies. This is compared with paraganglioma found in man.