Neurosurgery
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Although recognized since the 18th century, radiculomedullary arteries (RMAs) originating from upper thoracic intersegmental arteries are generally considered to be inconstant branches of little clinical importance. Yet, such vessels are commonly observed during spinal angiography. ⋯ A significant upper thoracic anterior RMA distinct from the artery of Adamkiewicz appears to be a constant anatomic feature, which undermines the classic concept of an arterial watershed zone in the thoracic region. We propose to name this artery after Albrecht von Haller, who documented its existence in 1754.