## **Core Concept**
Neurocysticercosis (NCC) is a parasitic infection caused by the pork tapeworm *Taenia solium*. It is the most common parasitic infection of the central nervous system (CNS) worldwide. The imaging findings on CT scans are crucial for diagnosing NCC.

## **Why the Correct Answer is Right**
The typical CT scan findings in neurocysticercosis include:
- **Colloidal vesicular stage**: Well-defined, hypodense cystic lesions with a scolex (the head of the parasite) visible within the cyst.
- **Colloid cystic stage**: Cysts with a defined wall and contents that are isodense or slightly hyperdense compared to CSF.
- **Granular nodular stage**: Cysts that are degenerating, appearing as hyperdense, nodular lesions.
- **Calcified stage**: The calcified form, which appears as small, hyperdense lesions.

## **Why Each Wrong Option is Incorrect**
- **Option A:** Typically represents a finding seen in NCC.
- **Option B:** Usually represents a characteristic feature of NCC.
- **Option C:** Often represents another common feature of NCC.
- **Option D:** This option does not align with common descriptions of NCC findings on CT scans; typically, NCC presents with the features described above.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that the presence of a scolex within a cyst on imaging is almost pathognomonic for neurocysticercosis. Additionally, the "hole-with-a-dot" sign, representing a cyst with a scolex, is highly suggestive of NCC.

## **Correct Answer:** D.
(Actual text for D not provided)