Cerebellar Sign Examination Approach

Core Components of Cerebellar Examination

The American Academy of Otolaryngology-Head and Neck Surgery recommends a systematic assessment of coordination, gait, balance, and eye movements to detect cerebellar dysfunction, which impacts patient mortality and quality of life, with gait assessment involving observation of the patient walking normally and in tandem gait to detect ataxia, wide-based gait, and instability 1, 2
The American College of Radiology suggests looking for truncal ataxia and titubation, which particularly suggest midline cerebellar involvement, with a significant increase in risk of falls in patients with cerebellar disorders 1, 3
Assess for increased risk of falls, which is significantly higher in patients with cerebellar disorders and directly impacts morbidity, with the American Academy of Otolaryngology-Head and Neck Surgery recommending assessment of gait and balance 1

The American Academy of Otolaryngology-Head and Neck Surgery differentiates cerebellar ataxia from sensory/proprioceptive ataxia, with cerebellar ataxia showing coordination problems that persist with eyes open or closed, and sensory ataxia worsening significantly with eyes closed (positive Romberg test) 1, 4
The American College of Radiology rules out central causes that may mimic peripheral vertigo, with downbeating nystagmus without torsional component, direction-changing nystagmus without head position changes, and baseline nystagmus without provocative maneuvers 1

The American Academy of Otolaryngology-Head and Neck Surgery identifies sudden onset of cerebellar symptoms as a red flag, which may indicate stroke, particularly if accompanied by dysarthria, dysphagia, dysmetria, sensory or motor deficits, or Horner's syndrome 1, 4

The American College of Radiology recommends MRI of the head without IV contrast as the preferred initial imaging for suspected cerebellar disorders, which can detect morphologic changes and signal alterations in the cerebellum and brainstem 5, 6
Advanced MRI techniques such as diffusion-weighted imaging and spectroscopy may detect early changes in cerebellar ataxia, according to the American College of Radiology 6
CT has inferior soft tissue contrast but may detect calcifications in rare subtypes of spinocerebellar ataxia, as suggested by the American College of Radiology 7

The American College of Radiology warns against failing to distinguish between cerebellar and sensory ataxia, which require different diagnostic approaches, and not assessing for fall risk, which is significantly increased in patients with cerebellar symptoms 1, 4