**Core Concept**
Epidural hematoma is a type of intracranial hemorrhage that occurs between the dura mater and the skull, typically caused by a traumatic head injury. This condition can lead to increased intracranial pressure, brain herniation, and death if not promptly treated.

**Why the Correct Answer is Right**
The most important step in initial management of a patient with an epidural hematoma is to secure the airway, breathing, and circulation (ABCs) and obtain an immediate non-contrast computed tomography (CT) scan of the head to confirm the diagnosis. The patient's dilated pupil and loss of consciousness are indicative of a mass effect, which requires urgent surgical intervention to evacuate the hematoma and relieve the pressure on the brain. This is typically performed by a neurosurgeon.

**Why Each Wrong Option is Incorrect**
* **Option A:** Administering steroids is not a recommended initial step in managing an epidural hematoma, as it does not address the underlying cause of the condition.
* **Option B:** Ordering a lumbar puncture (LP) is contraindicated in patients with suspected epidural hematoma, as it can further increase intracranial pressure and worsen the condition.
* **Option D:** Starting anticoagulation therapy is not indicated in this scenario, as it may exacerbate bleeding and worsen the patient's condition.

**Clinical Pearl / High-Yield Fact**
In cases of suspected epidural hematoma, it is crucial to obtain a prompt head CT scan to avoid delayed diagnosis and treatment. A delay of more than 4 hours between the initial trauma and surgical intervention can significantly worsen the patient's outcome.

**Correct Answer:** C.