**Question:** Parietal abscess is also known as

A. Subdural abscess
B. Empyema
C. Intracranial abscess
D. Epidural abscess

**Correct Answer:** D. Epidural abscess

**Core Concept:**
Parietal abscess refers to an infection in the outer layer of the brain, which is called the meninges. These types of abscesses are classified into two main categories:

1. Intracranial abscess: An infection in the brain parenchyma, or the actual tissue of the brain.
2. Epidural abscess: An infection involving the outer layer of the brain, known as the subarachnoid space, which is located between the pia mater (inner layer of the meninges) and the dura mater (outer layer of the meninges).

**Why the Correct Answer is Right:**
Epidural abscess is the correct answer because it is the correct term for the infection involving the outer layer of the meninges, which is the parietal abscess. Intracranial abscess refers to an infection within the brain tissue, while subdural abscess is an infection in the subdural space between the dura mater and the skull.

**Why Each Wrong Option is Incorrect:**

A. Subdural abscess (Option A) is incorrect because this type of abscess involves the space between the dura mater and the skull, not the outer layer of the meninges. Subdural abscesses are different from parietal abscesses.

B. Empyema (Option B) refers to an infection in the pleural space, specifically in the pleural cavity surrounding the lungs, not the parietal layer of the meninges. Empyema is an infection in the pleural space, not the meninges.

C. Intracranial abscess (Option C) is incorrect because this type of abscess involves the brain parenchyma, or the actual tissue of the brain, not the outer layer of the meninges. Intracranial abscesses are different from parietal abscesses.

**Clinical Pearl:**
Epidural abscesses are a clinical entity that warrants high suspicion in patients with focal neurological deficits, altered mental status, or focal seizures, especially in those with a history of recent neurosurgical procedures or central venous catheters. Prompt diagnosis and treatment are crucial to prevent neurological complications.