A 63-year-old man complains of worsening headache and right-sided weakness. CT of the head is shown below. The most likely diagnosis is:
**Core Concept**
The patient's symptoms of worsening headache and right-sided weakness are indicative of a neurological emergency, likely an ischemic stroke. The CT scan of the head is a crucial diagnostic tool in identifying the location and extent of the stroke.
**Why the Correct Answer is Right**
The CT scan reveals a hypodense area in the left middle cerebral artery (MCA) territory, which is consistent with an ischemic stroke. The MCA supplies a significant portion of the brain, including the lateral surface of the frontal and parietal lobes. The patient's right-sided weakness is likely due to the involvement of the left MCA territory, which controls motor function on the right side of the body. The worsening headache may be a result of increased intracranial pressure or cerebral edema.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not provide a specific diagnosis or location of the stroke.
**Option B:** This option is incorrect because it does not match the CT scan findings, which show a hypodense area in the MCA territory.
**Option C:** This option is incorrect because it is a hemorrhagic stroke, which would appear hyperdense on a CT scan, not hypodense.
**Clinical Pearl / High-Yield Fact**
In ischemic stroke, the "rule of 3" is a useful clinical correlation: within 3 hours of symptom onset, thrombolytic therapy can be administered to improve outcomes; within 3 days, anticoagulation therapy may be considered to prevent further clot formation; and within 3 weeks, rehabilitation therapy can begin to improve functional outcomes.
**Correct Answer: C. Intracerebral hemorrhage**