**Core Concept**
A meningioma is a type of brain tumor arising from the meninges, the protective membranes surrounding the brain and spinal cord. Meningiomas are typically slow-growing and benign, but can cause symptoms due to their location and pressure on surrounding brain tissue. They are often diagnosed using imaging studies like CT scans.

**Why the Correct Answer is Right**
Meningiomas usually appear as well-circumscribed, homogeneous masses on CT scans, often with a dural tail sign, which is a tail of soft tissue extending from the mass into the dura mater. This is due to the tumor's origin from the arachnoid cap cells of the meninges. The dural tail sign is a characteristic feature that helps differentiate meningiomas from other types of brain tumors.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not specify the characteristic features of a meningioma on CT scan.
**Option B:** This option is incorrect as it does not provide any specific information about the appearance of the lesion on CT scan.
**Option C:** This option is incorrect as it is not a characteristic feature of a meningioma on CT scan.

**Clinical Pearl / High-Yield Fact**
Meningiomas are often associated with a dural tail sign on CT scans, which is a soft tissue extension from the tumor into the dura mater. This is a key feature to look for when diagnosing meningiomas.

**Correct Answer:** Not provided