We report an unusual case of selective lower motor neuron syndrome (MNS) complicating whole neuraxis radiation therapy. Only three well-documented similar cases have been found in a thorough review of the literature. The syndrome has a stereotyped time course and is self-limited. We discuss here possible pathogenetic mechanisms and their relationship to motor neuron disease.
✓ Microsurgical dissection of trigeminal nerves in autopsy specimens demonstrates that the so-called “accessory rootlets” are really a component of the motor root. This confirms Meckel's description of 1748.
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