Intermittent unilateral weakness in a patient raises suspicion for which diagnosis?

Intermittent unilateral weakness in a patient raises suspicion for which diagnosis?

• A. Stroke
• B. Bell palsy
• C. TIA
• D. Migraine

Answer: (C)

Intermittent unilateral weakness points to a transient disruption of blood flow to the brain causing focal neurologic symptoms that come and go. This pattern is classic for a transient ischemic attack, a temporary ischemic event where the deficit resolves completely, typically within minutes to hours, leaving no lasting damage. Recognizing this distinction is crucial because TIAs are real warning signs of stroke risk and require prompt evaluation and management to prevent a completed stroke. The other possibilities fit less well. A stroke usually produces persistent neurological deficits rather than intermittent ones. Bell palsy causes weakness of facial muscles due to facial nerve damage, not a transient weakness of the limbs on one side. Migraine can involve transient neurologic symptoms, especially in hemiplegic migraine, but it is typically accompanied by headache and a characteristic aura, and the presentation is not as classically described as sudden, focal, and fully reversible limb weakness.

Intermittent unilateral weakness points to a transient disruption of blood flow to the brain causing focal neurologic symptoms that come and go. This pattern is classic for a transient ischemic attack, a temporary ischemic event where the deficit resolves completely, typically within minutes to hours, leaving no lasting damage. Recognizing this distinction is crucial because TIAs are real warning signs of stroke risk and require prompt evaluation and management to prevent a completed stroke.

The other possibilities fit less well. A stroke usually produces persistent neurological deficits rather than intermittent ones. Bell palsy causes weakness of facial muscles due to facial nerve damage, not a transient weakness of the limbs on one side. Migraine can involve transient neurologic symptoms, especially in hemiplegic migraine, but it is typically accompanied by headache and a characteristic aura, and the presentation is not as classically described as sudden, focal, and fully reversible limb weakness.