[A case of vertebral artery dissection diagnosed using gadolinium-based contrast agent in a patient with iodine allergy].

The patient was a 34-year-old man who sustained multiple injuries in a traffic accident, including multiple rib fractures, splenic injury, and a right temporal bone fracture. To evaluate the splenic injury, contrast-enhanced CT scans were performed multiple times; however, the patient developed nausea and was subsequently diagnosed with iodine hypersensitivity. Five years after the traffic accident, he began experiencing diplopia, prompting an MRI scan that revealed a cerebral infarction in the right midbrain. As he continued to suffer recurrent cerebral infarctions, cerebral angiography using gadolinium-based contrast agents was performed, which identified a dissecting aneurysm in the left vertebral artery. Neurological symptoms may appear in a delayed fashion following traffic trauma, and even in patients with iodine hypersensitivity, gadolinium-based contrast agents can aid in diagnosis.