Clinical Reasoning: A 49-Year-Old Woman With Isolated Sinus Intracranial Dural Arteriovenous Fistula With Perimedullary Drainage.

While demyelination is the most common etiology of longitudinally extensive myelopathy, other causes are important to recognize. In this study, we present the case of a longitudinal cervical lesion with a very rare cause. We discuss the approach to the differential diagnosis and workup for longitudinal myelopathy. This clinical reasoning case also illustrates the anatomical relationship between symptomatic spinal cord lesions and nonsymptomatic intracranial etiologies.