Radiation-induced brain injury, being a serious complication after radiotherapy, is a disease of nervous system damage caused by radiation therapy for patients with head and neck cancer. Since radiation therapy can cause large blood vessel stenosis or blockage, when it damages the brain stem, Wallenberg syndrome may appear.We report a case of Wallenberg syndrome induced by radiation therapy.Wallenberg syndrome caused by radiation-induced brain injury is easy for clinicians to miss diagnosis or misdiagnose. Early head MR examination plays a pivotal role in reduce its occurrence rate. Clinicians should be vigilant of the blocked vascular caused by radiation therapy and initiate early thrombolysis, vascular angioplasty or stenting to make the patients get better prognosis.Keywords: Wallenberg syndrome; Radiation-induced brain injury; Miss diagnose; Misdiagnose pressure was 174/97mmHg, the right pupil measured 2.5 mm, the left pupil measured 3.0 mm, both pupils were sensitive to light, the right side of the nose was slightly shallow, the tongue extended to the right and pharyngeal reflex disappeared. CT scan of the brain ( Figure 1A) showed radiation-induced bilateral temporal lobe lesions with no abnormalities in the brain stem. Cervical computed tomography angiography (CTA) ( Figure 1B) was performed after neck vascular ultrasound indicating that the right vertebral artery may be embolized, and the right vertebral artery was proved to be occluded by the CTA. The contrast-enhanced magnetic resonance imaging (MRI) and fluidattenuated inversion recovery (FLAIR) ( Figure 1C-1I) demonstrated an acute infarction in the right medulla and radiation-induced brain injury in bilateral temporal lobe.After his admission to the hospital, he got the treatment of antiplatelet agents, neuroprotective drugs and other symptomatic support treatment. Fifty days later, the patient was out of the hospital with a nasogastric tube, and neurologic examination showed that pharyngeal reflex disappeared.Informed consent was obtained from the patient and this case study was approved by the hospital ethical committee.
DiscussionTo our knowledge, this is the first case report of Wallenberg syndrome caused by radiation-induced brain injury.The patient's brain CT scan did not show the brain stem lesions in his first visit to a hospital. With the progress of the disease, the medullary infarction was finally demonstrated by the contrastenhanced MRI, which still had not been observed by the second CT scan of the brain. In fact, the patient was likely to have been at the early stage of cerebral infarction at his first visit to the hospital according to his symptoms. However, due to the limitations of brain CT in the diagnosis of brain stem lesions and the diversity of the symptoms of
Case PresentationRadiation-induced brain injury, being a serious complication after radiotherapy, is a disease of nervous system damage caused by radiation therapy for patients with head and neck cancer [1]. Since radiation therapy can cause large blood vessel s...