Neurology

Progressive cervical myelopathy due to intramedullary migration of forgotten Torkildsen shunt

A 65-year-old woman with cerebellar astrocytoma resected at age 4 years complicated by hydrocephalus presented with progressive myelopathy, starting in her 40s. Her ventriculoperitoneal shunt continued to function normally. Cervical spine MRIs were interpreted as cervicomedullary syringobulbia (figure 1). Closer examination of imaging and medical history, however, revealed a retained but no-longer-functional Torkildsen shunt (TS) penetrating the spinal cord (figures 1 and 2). These shunts, commonly used in the 1950s, comprised red rubber tubing to divert CSF from lateral ventricles to the cisterna magna. Degeneration, calcification, and migration of the TS are rare causes of cervical myelopathy.1,2 Removal is not feasible.

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