**Core Concept**
Subdural effusions are collections of fluid between the dura mater and the arachnoid membrane, often associated with bacterial meningitis. The underlying principle involves the spread of infection and inflammation to the subdural space. This condition is more common in children and can lead to increased intracranial pressure.

**Why the Correct Answer is Right**
The correct answer is related to the fact that subdural effusions in association with acute bacterial meningitis are more commonly seen in children, particularly those under the age of 2. The mechanism involves the direct spread of bacteria from the subarachnoid space to the subdural space, leading to inflammation and fluid accumulation.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the correct population or association.
**Option B:** This option is incorrect as it does not accurately describe the relationship between subdural effusions and bacterial meningitis.
**Option C:** This option is incorrect because it does not correctly identify the condition or its association with bacterial meningitis.
**Option D:** This option is incorrect as it is not the correct answer choice.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that subdural effusions can be a complication of bacterial meningitis, particularly in young children. It's essential to consider this possibility when managing patients with meningitis.

**Correct Answer:** D. More common in children.