Clinical Features of Pontine Stroke Syndrome

Presentation and Diagnosis

The American College of Radiology notes that pontine stroke syndromes present with characteristic combinations of motor deficits, cranial nerve palsies, and sensory disturbances that vary based on the specific anatomical location of the infarct within the pons 1, 2, 3
Horizontal gaze abnormalities are the hallmark feature of tegmental (dorsal) pontine infarcts, according to the American College of Radiology 1
Locked-in syndrome with proximal basilar occlusions is a possible presentation of bilateral pontine infarcts, as reported in the Journal of Neurointerventional Surgery 2, 3
The American Heart Association and American Stroke Association acknowledge that posterior circulation strokes frequently present with non-specific symptoms that delay diagnosis, including headache, nausea, vomiting, dizziness, vertigo, double vision, hearing loss, slurred speech, and imbalance 2, 3
Ataxia, particularly truncal ataxia, is a common neurological sign in patients with pontine stroke, often missed during bedside examination, according to the American Heart Association and American Stroke Association 2, 3, 4

The National Institute of Neurological Disorders and Stroke notes that the NIHSS significantly underestimates posterior circulation stroke severity because it emphasizes limb weakness and speech over cranial nerve deficits 2, 3
Patients with pontine stroke can have an NIHSS score of 0 despite significant disability, highlighting the importance of thorough clinical evaluation, as reported in the Journal of Neurointerventional Surgery 2, 3
Truncal ataxia is the most common neurological sign in NIHSS 0, DWI-positive patients, according to the Journal of Neurointerventional Surgery 2, 3

Neurological deterioration typically occurs within 72-96 hours in patients with significant mass effect, with peak swelling occurring several days after onset, as reported in the journal Stroke 4
Some patients deteriorate at 4-10 days due to delayed swelling and hemorrhagic transformation, highlighting the need for close monitoring, according to the journal Stroke 4

Approximately one‑quarter of all stroke patients experience headache as an initial symptom of pontine infarction, reflecting the frequent involvement of posterior circulation structures. 5
Nausea and vomiting are commonly reported when the brainstem or cerebellum is affected in pontine stroke, indicating vestibular and autonomic pathway irritation. 5