Metastases to the medulla of the spinal cord: myelographic features.

Intramedullary metastases to the spinal cord of non-neurogenic origin are exceedingly rare, comprising fewer than 1.6% of all metastases affecting the spinal canal and its contents. Plain films are normal. Irregular fusiform widening of the spinal cord is the most common myelographic feature, although nodularity is also present. Complete blockage is very rare. The authors describe the radiological features in 4 cases of intramedullary metastases of non-neurogenic origin. The differential diagnosis is discussed, and some pathogenetic mechanisms are postulated. It is important to recognize intramedullary metastases in order to plan the proper management.