Brainstem Stroke

Activate an acute stroke pathway for abrupt or stuttering diplopia, dysarthria, dysphagia, vertigo with inability to walk, limb or truncal ataxia, nystagmus, extraocular movement abnormality, crossed cranial nerve and long-tract findings, bilateral weakness, or impaired consciousness. Vertebrobasilar TIAs precede posterior-circulation stroke in approximately one-quarter of cases, and fleeting or fluctuating vertebrobasilar symptoms should prompt direct assessment of basilar patency. PubMedPubMedIschemic Posterior Circulation Stroke: A Review of Anatomy, Clinical Presentations, Diagnosis, and Current Management

Escalate immediately when consciousness declines, bulbar dysfunction threatens the airway, or examination suggests basilar artery occlusion: acute dysarthria, cranial nerve abnormalities, motor deficits, and altered consciousness are recognized basilar occlusion presentations. Brainstem ischemia can disrupt respiratory, cardiovascular, arousal, and sensorimotor pathways; therefore, stabilize airway and ventilation while obtaining emergent neurovascular imaging rather than observing for symptom evolution. PubMed+1PubMedVertebrobasilar Stroke - StatPearls - NCBI BookshelfPubMedBasilar Artery Occlusion - StatPearls - NCBI Bookshelf

In younger patients or after trauma, specifically ask about cervical pain or headache. These features, particularly with neurologic deterioration, should raise concern for vertebral artery dissection, which may propagate into the basilar artery or generate distal thromboembolism. PubMedPubMedBasilar Occlusion Syndromes: An Update - PMC

Perform immediate noncontrast head CT in suspected acute stroke when thrombolysis or thrombectomy is being considered, when consciousness is depressed, or when bleeding risk is relevant. CT rapidly identifies hemorrhage; however, posterior fossa ischemia may be occult early, so a nondiagnostic CT must not end the evaluation of a brainstem-localizing syndrome. nice org uk+1nice org ukRecommendations | Stroke and transient ischaemic attack in over 16s: diagnosis and initial management | Guidance | NICEAHA JournalsIncremental Value of Computed Tomography Perfusion for Final Infarct Prediction in Acute Ischemic Cerebellar Stroke

Add CTA promptly to identify vertebral or basilar arterial occlusion and to distinguish basilar occlusion from isolated small-vessel brainstem infarction. CTA is described as highly accurate for acute basilar artery occlusion, and standard CT plus CTA evaluates key alternatives including hemorrhage and basilar occlusion in suspected acute cerebellar stroke. AHA Journals+1AHA JournalsHyperdense Basilar Artery Sign on Unenhanced CT Predicts Thrombus and Outcome in Acute Posterior Circulation Stroke | StrokeAHA JournalsIncremental Value of Computed Tomography Perfusion for Final Infarct Prediction in Acute Ischemic Cerebellar Stroke

Use MRI with diffusion-weighted imaging when it can be obtained without delaying acute reperfusion decisions or when CT/CTA does not explain a persistent focal posterior-circulation syndrome. DWI confirms acute brainstem and cerebellar infarction, while FLAIR hyperintensity within the basilar artery can support suspicion for basilar occlusion in patients with acute brainstem stroke. PubMed+1PubMedCerebellar Infarction - StatPearls - NCBI BookshelfajnrHyperintense Basilar Artery on FLAIR MR Imaging: Diagnostic Accuracy and Clinical Impact in Patients with Acute Brain Stem Stroke | American Journal of Neuroradiology

Estimate posterior-circulation ischemic injury using pc-ASPECTS when basilar occlusion is being evaluated for thrombectomy. In a stent-retriever thrombectomy cohort, pretreatment DWI pc-ASPECTS of at least 7 versus lower values was associated with outcome, and the cited 2026 guidance uses pc-ASPECTS of at least 6 as part of a basilar-occlusion thrombectomy selection framework. AHA Journals+1AHA JournalsPredictors of Good Outcome After Stent-Retriever Thrombectomy in Acute Basilar Artery Occlusion | StrokePubMedCerebellar Infarction - StatPearls - NCBI Bookshelf

A confirmed basilar artery occlusion is the highest-acuity branch. Basilar occlusion commonly reflects thromboembolism, atherosclerotic disease, or dissection and can affect proximal or middle basilar segments. Treat it as a reperfusion decision rather than as a diagnostic endpoint; document occlusion location, infarct burden, NIHSS, premorbid function, and last-known-well time for thrombectomy selection. PubMed+1PubMedBasilar Artery Occlusion - StatPearls - NCBI BookshelfPubMedCerebellar Infarction - StatPearls - NCBI Bookshelf

When CTA or MRA demonstrates vertebral arterial pathology in a patient with neck pain, headache, trauma, or younger age, prioritize vertebral dissection as the mechanism. Dissection can directly extend into the basilar wall, creating low- or no-flow physiology, or form thrombus that embolizes distally; this explains why cervical vessel imaging is required even when the infarct is intracranial. PubMedPubMedBasilar Occlusion Syndromes: An Update - PMC

In patients with vascular risk factors and vertebral-basilar stenosis, large-artery atherosclerotic disease becomes more likely. Symptomatic intracranial vertebral and basilar stenosis carries reported annual stroke rates of 8% and 11%, respectively, and vertebrobasilar atherosclerotic stenosis of at least 50% is associated with increased 90-day recurrent stroke risk. PubMedPubMedVertebral Artery Interventions: A Comprehensive Updated Review

Cardioembolism remains a major cause of brainstem infarction and basilar occlusion. When CTA demonstrates an abrupt arterial occlusion without a dissection pattern or a clear fixed culprit lesion, pursue a cardiac embolic source as part of the secondary-prevention workup; cardiac evaluation should not delay acute reperfusion treatment. Large-vessel atherosclerosis, small-vessel perforator disease, cardioembolism, and vertebral dissection are leading brainstem infarct mechanisms. PubMedPubMedBrainstem Stroke - StatPearls - NCBI Bookshelf

A small, strategically located pontine, medullary, or midbrain infarct without a large-vessel occlusion shifts the working mechanism toward perforator disease, but serial observation remains necessary because examination can evolve and posterior fossa edema may cause delayed deterioration when cerebellar involvement coexists. PubMed+1PubMedBrainstem Stroke - StatPearls - NCBI BookshelfPubMedCerebellar Infarction - StatPearls - NCBI Bookshelf

For acute ischemic stroke with confirmed basilar artery occlusion, evaluate immediately for intravenous thrombolysis within the applicable licensed treatment window and do not delay thrombectomy transfer or activation to complete treatment response assessment. NICE recommends thrombectomy with intravenous thrombolysis when not contraindicated and within the licensed window, as soon as possible for proximal posterior-circulation occlusion demonstrated by CTA or MRA. nice org uknice org ukRecommendations | Stroke and transient ischaemic attack in over 16s: diagnosis and initial management | Guidance | NICE

The cited 2026 basilar-occlusion selection framework recommends endovascular thrombectomy within 24 hours for patients with baseline mRS 0-1, NIHSS at least 10, and pc-ASPECTS at least 6. For NIHSS below 10, thrombectomy effectiveness has not been established in that guidance; involve a comprehensive stroke center rather than treating low apparent severity as proof of low risk. PubMedPubMedCerebellar Infarction - StatPearls - NCBI Bookshelf

Do not use extensive posterior-circulation DWI signal as an automatic reason to withhold reperfusion without expert review. DWI lesions are commonly used as a surrogate for irreversible core, but posterior-circulation cases have demonstrated sustained lesion reversal after intravenous thrombolysis and endovascular reperfusion. ScienceDirectScienceDirectDWI lesions reversal in posterior circulation stroke after reperfusion: Two illustrative cases and review of the literature - ScienceDirect

For wake-up or unknown-onset ischemic stroke, MRI-based selection can identify patients for thrombolysis when imaging demonstrates an acute DWI lesion without corresponding FLAIR hyperintensity in the cited trial framework. Apply this approach within an institutional acute-stroke protocol and in parallel with CTA-based large-vessel-occlusion assessment. NEJMNEJMMRI-Guided Thrombolysis for Stroke with Unknown Time of ...

Admit patients with acute brainstem or cerebellar infarction to a setting capable of frequent neurologic and respiratory reassessment. Worsening arousal, new cranial nerve or bulbar deficits, evolving quadriparesis, or abnormal respiratory pattern should prompt immediate reevaluation for infarct progression, recurrent vascular occlusion, hemorrhagic transformation, or posterior fossa mass effect. Brainstem injury can disrupt respiratory and cardiovascular control, and cerebellar edema can produce brainstem compression or herniation. PubMed+1PubMedVertebrobasilar Stroke - StatPearls - NCBI BookshelfPubMedCerebellar Infarction - StatPearls - NCBI Bookshelf

For cerebellar involvement, maintain a low threshold for repeat brain imaging when headache, vomiting, declining consciousness, or new focal deficits emerge. Cerebellar infarction is high-risk because edema develops within the confined posterior fossa, and management may require intervention for hydrocephalus or mass effect. PubMed+1PubMedCerebellar Infarction - StatPearls - NCBI BookshelfPubMedIschemic Posterior Circulation Stroke: A Review of Anatomy, Clinical Presentations, Diagnosis, and Current Management

After the acute phase, anchor secondary prevention to the demonstrated mechanism rather than labeling the event nonspecifically. Identify vertebral-basilar atherosclerotic disease, vertebral dissection, cardioembolism, or perforator disease from vascular imaging, infarct distribution, and cardiac assessment; symptomatic vertebrobasilar atherosclerotic disease is particularly important because recurrence risk is elevated early after the index event. PubMed+2PubMedVertebral Artery Interventions: A Comprehensive Updated ReviewPubMedBrainstem Stroke - StatPearls - NCBI BookshelfPubMedBasilar Occlusion Syndromes: An Update - PMC