A 70-year-old woman presents with acute right-sided weakness and slurred speech that began 30 minutes ago. She has a history of intracerebral hemorrhage 2 years ago. BP is 210/110 mm Hg. She is somnolent. The team needs rapid imaging to evaluate for recurrent hemorrhage and guide blood pressure management and neurosurgical planning. Which neuroimaging modality is most appropriate for the initial evaluation?
- Noncontrast CT of the head (correct answer)
- MRI brain with gadolinium
- CT of the lumbar spine
- MR venography
- Lumbar puncture for CSF analysis
Explanation: This question tests USMLE Step 2 CK skills in neuroimaging and cerebrospinal fluid analysis, focusing on appropriate test selection and interpretation. Neuroimaging and CSF analysis are critical in diagnosing and managing neurologic conditions, requiring knowledge of when and how to apply these tests. In this vignette, the patient's presentation includes acute weakness, hypertension, and prior ICH history, guiding the choice of noncontrast head CT. The correct answer, A, is appropriate because it aligns with the clinical presentation and current guidelines, providing rapid detection of recurrent hemorrhage. Choice B is incorrect due to being less urgent for bleed, which often results from delaying with advanced imaging. Teaching strategies include reinforcing the decision tree approach to imaging and CSF analysis, emphasizing guideline-based practice, and reviewing case studies that illustrate common pitfalls.