USMLE High-Yield Questions on Instagram: "“They said it would fix his posture… not rearrange his brainstem.” 💀🦴 ⸻ 🧠 Step-Level Explanation (High-Yield) This question hinges on TIMING + TRIGGER + SYMPTOMS. Key red flags: • Recent neck manipulation • Sudden onset severe posterior (occipital) headache • Vertigo + nausea → posterior circulation involvement Chiropractic neck manipulation can cause intimal tearing of the vertebral artery, leading to: • Artery dissection • Thrombus formation • Poste