Monoparesis due to spinal cord infarction associated with thoracoabdominal aneurysm

We describe a case of acute monoparesis of a lower limb due to asymmetric spinal cord infarction in a patient with previously unrecognized thoracoabdominal aneurysm. The clinical course suggested that the likely reason for the spinal cord infarction was thromboembolism originating from the aneurysm's mural thrombi. This rare entity should be considered when managing patients with acute mono- or paraparesis who have a thoracoabdominal aneurysm with mural thrombi because interventions aimed at preventing further embolisms could be beneficial in these patients.