A patient presents with recurrent episodes of vertigo, nausea, and nystagmus, often triggered by head movements. Dix-Hallpike maneuver elicits positional vertigo and rotary nystagmus. Which of the following conditions is most likely responsible for this presentation?
Correct Answer: B
Rationale: The patient's presentation with recurrent episodes of vertigo, nausea, and nystagmus triggered by head movements, along with a positive Dix-Hallpike maneuver eliciting positional vertigo and rotary nystagmus, is classic for Benign Paroxysmal Positional Vertigo (BPPV). BPPV is the most common cause of vertigo due to a mechanical problem in the inner ear. In BPPV, brief episodes of vertigo are typically triggered by specific head movements, such as rolling over in bed or looking up. The characteristic rotary nystagmus observed in BPPV is consistent with the brief, intense episodes of vertigo that patients experience. The Dix-Hallpike maneuver, commonly used to diagnose BPPV, involves moving the patient from sitting to a supine head-hanging position and can induce vertigo and nystagmus in affected