Uncommon Cause, Common Symptom: Understanding Vertigo and Cerebellar Strokes
"New research highlights how vertigo can be an early sign of cerebellar nodulus stroke, urging vigilance in diagnosis."
Vertigo, a sensation of spinning or dizziness, is a common complaint in general practice. While many cases of vertigo are benign, some can signal more serious underlying conditions, such as stroke. Positional vertigo, specifically, requires careful evaluation to pinpoint its cause.
Benign paroxysmal positional vertigo (BPPV) is frequently identified as the culprit. It arises from displaced otolithic debris within the semicircular canals of the inner ear, disrupting the sense of balance. However, central causes, such as brain lesions, can also trigger positional vertigo. Brain-related vertigo often stems from issues in the posterior fossa, fourth ventricle, or cerebellum.
The cerebellar nodulus, a small but critical part of the cerebellum, can be a focal point for stroke-induced vertigo. What makes this particularly challenging is that nodulus-related vertigo may occur without any other obvious neurological deficits. Adding to the complexity, vertigo caused by stroke may only last briefly, from hours to a few days. In such cases, early and accurate brain imaging becomes essential for proper diagnosis. Here, we explore three cases where cerebellar nodulus stroke was diagnosed through magnetic resonance imaging (MRI).
Three Cases of Isolated Nodulus Stroke
A report described three patients with isolated cerebellar nodulus stroke: two men, aged 69 and 71, and an 82-year-old woman. Each presented with positional vertigo alone, lasting only 2–4 days. The cases illustrate that a cerebellar stroke can present with a brief positional-vertigo symptom without other reported symptoms in these patients.
Recognizing Central Positional Vertigo
A 2019 report described three people with isolated cerebellar nodulus strokes whose only reported symptom was positional vertigo lasting 2–4 days. Brain MRI helped diagnose the cases, and the authors urged clinicians to consider this rare stroke in people with paroxysmal vertigo. A separate clinical case described suspected central positional vertigo or nystagmus that led to MRI, which suggested a right cerebellar infarct. A provider fact sheet cautions that cerebellar stroke may not initially appear on CT and should be considered when the clinical picture does not fit common alternatives such as BPPV, vestibular neuritis, or vestibular migraine.
When Vertigo Isn't Just Vertigo: Spotting Cerebellar Stroke
The link between positional vertigo and cerebellar nodulus stroke may seem surprising, but understanding the anatomy and function of the cerebellum sheds light on this connection. The cerebellum, located at the back of the brain, plays a crucial role in coordinating movement, maintaining balance, and controlling eye movements. The nodulus, a small lobe within the cerebellum, is particularly involved in processing vestibular information, which is essential for spatial orientation and balance.
- Case 1: A 71-year-old man with mild diabetes experienced severe positional vertigo without auditory or neurological symptoms. Initially suspected of BPPV, an MRI revealed a 5 mm lacunar infarct in the right cerebellar nodulus. His vertigo resolved within four days.
- Case 2: A 69-year-old healthy man presented with positional vertigo triggered by head movements. He had direction-changing horizontal nystagmus. An MRI showed a 6 mm lacunar infarct in the left cerebellar nodulus. His symptoms resolved in three days.
- Case 3: An 82-year-old woman with hypertension experienced acute positional vertigo. Despite no observed nystagmus during examination, she complained of vertigo after each maneuver. An MRI revealed a 4 mm infarct in the left cerebellar nodulus. Her vertigo disappeared within 12 hours.
Vertigo from Small Vascular Lesions
A review of isolated vascular vertigo explains that small infarcts in the nodulus, the eighth-nerve root entry zone at the pontomedullary junction, or the vestibular nucleus can theoretically cause vertigo without other neurological symptoms or signs. A 2026 report of patients referred for MRI found stroke or infarction in every patient; the cerebellum was the most frequent lesion location, with 36 patients (45.6%). The nodulus, cerebellar peduncle, medulla, and cerebellar vermis were also reported as locations, in 10, 7, 7, and 6 patients, respectively. These sources describe both the possibility of isolated symptoms and the range of lesion locations, rather than establishing how often all vertigo represents stroke.
Diagnostic Clues—and Evidence Limits
A systematic review and meta-analysis notes that it did not examine signs and symptoms associated with vertigo or dizziness because of extraction issues in the underlying studies, while acknowledging that accompanying symptoms might help identify cerebellar strokes. A clinical review reports that 71% of patients with cerebellar infarction and isolated vertigo were unable to walk without support, but notes that the observers assessing this finding were not blinded to diagnosis. Another review estimates that cerebellar dizziness and vertigo account for approximately 10% of diagnoses in a tertiary dizziness center and encompass chronic, recurrent, and acute conditions. One emergency-department review snippet gives estimates of 0.7–3% for cerebellar infarction among patients with isolated vertigo and an estimated 35% misdiagnosis rate, underscoring both diagnostic overlap and uncertainty across reported figures.
Different Presentations of Nodular Infarction
Reports show that isolated cerebellar nodulus infarction can present in different ways. In one report, three patients—two men aged 69 and 71 and a woman aged 82—had positional vertigo alone lasting 2–4 days. A separate report described three patients who all suddenly developed nausea, vomiting, and difficulty walking. Another study recruited eight patients with isolated nodular infarction from six hospitals in Korea, while a 2020 study set out to evaluate whether vascular risk factors and serum vitamin D could distinguish isolated central positional vertigo from BPPV in 78 consecutively enrolled patients.
Act Early, Diagnose Fast
Positional vertigo without other neurological deficits can be a tricky diagnostic puzzle. Stroke-related vertigo may only last a few hours or days. Therefore, it's critical to consider central causes like cerebellar nodulus stroke, particularly in patients with risk factors such as hypertension or diabetes. Early MRI can help visualize small strokes and guide appropriate management, preventing potential complications.
Understanding the Anatomy Behind Vertigo
The article describes the link between positional vertigo and cerebellar nodulus stroke as surprising. It points to the cerebellum’s location at the back of the brain and its roles in coordinating movement, maintaining balance, and controlling eye movements. This anatomical framing offers a basis for understanding why cerebellar disorders can be relevant to balance-related symptoms.
Vertigo as the Sole Early Symptom
A 2026 case report describes a 63-year-old man with poorly controlled hypertension who presented with brief, recurrent positional vertigo; the report identifies an uncommon infarction in the medial branch of the posterior inferior cerebellar artery (mPICA) territory. A separate report describes three patients, aged 69, 71, and 82, whose isolated cerebellar nodulus strokes presented with positional vertigo alone lasting 2–4 days. In those cases, brain MRI helped make the diagnosis. These reports illustrate why vertigo may warrant assessment for a central cause even when it is the prominent or sole reported symptom.