Evaluation and Management of Dizziness with Diplopia

Immediate Assessment and Red Flags

The American Academy of Neurology recommends urgent evaluation for posterior fossa pathology and aneurysm in patients presenting with dizziness and diplopia, as this combination suggests involvement of vestibular pathways and cranial nerves, which can be life-threatening 1
Pupil-involving third nerve palsy mandates immediate MRA or CTA to exclude posterior communicating artery aneurysm—a neurosurgical emergency, according to the American Heart Association 2, 1
Associated neurological symptoms, including ataxia, hemiparesis, sensory loss, Horner's syndrome, or internuclear ophthalmoplegia, indicate brainstem or cerebellar pathology requiring urgent imaging, as suggested by the American Academy of Neurology 1

The American College of Radiology recommends brain MRI with and without gadolinium plus MRA or CTA as the preferred initial study for all patients with diplopia and dizziness, especially when cranial nerve palsies are present 2, 1
Unenhanced CT of the head or orbits is not useful in the workup of diplopia, according to the American College of Radiology 2

Brainstem or cerebellar stroke can cause transient skew deviation, and more profound ischemic damage causes persistent symptoms, as reported by the American Heart Association 1
Posterior communicating artery aneurysm is a concerning cause of pupil-involving third nerve palsy, according to the American Association of Neurological Surgeons 2, 1
Microvascular ischemic cranial nerve palsies are associated with diabetes, hypertension, hyperlipidemia, and typically resolve within 6 months, as suggested by the American Diabetes Association 1

Occlusion with an eye patch, occlusive contact lens, or Bangerter foil provides immediate relief for diplopia while awaiting diagnosis, according to the American Academy of Ophthalmology 2, 1
Prism correction with press-on (Fresnel) or ground-in prisms can provide temporary relief for diplopia, although effectiveness is limited in incomitant deviations, as reported by the American Academy of Ophthalmology 2
Control of vascular risk factors, such as optimizing diabetes, hypertension, and hyperlipidemia management, is essential for patients with microvascular ischemic palsies, as suggested by the American Heart Association 1

Immediate ophthalmology/neurosurgery consultation is required for patients with pupil-involving third nerve palsy, signs of increased intracranial pressure, multiple cranial nerve palsies, or associated neurological deficits, according to the American Academy of Neurology 2, 1
Reassessment at 6 months is recommended for patients with microvascular ischemic palsies, and further evaluation for underlying pathology is warranted if no recovery is observed, as suggested by the American Academy of Neurology 1