All are Neurocysticercosis findings on CT scan except –
**Neurocysticercosis Findings on CT Scan**
**Core Concept**
Neurocysticercosis is a parasitic infection caused by the pork tapeworm Taenia solium, leading to the formation of cysts in the brain. On CT scans, these cysts can exhibit various appearances depending on their stage of development, inflammation, and calcification.
**Why the Correct Answer is Right**
The typical findings of neurocysticercosis on CT scans include:
* **Ring-enhancing lesions**: These are cysts with a visible scolex (head) and a surrounding inflammatory reaction, which can enhance with contrast.
* **Calified cysts**: These are cysts that have undergone calcification, often appearing as dense, rounded, or linear calcifications.
* **Cysticerci with surrounding edema**: These are cysts that are surrounded by edema, indicating an active inflammatory response.
* **Cysts with a "meniscus" sign**: This sign refers to a cyst with a well-defined scolex and a surrounding inflammatory reaction, giving the appearance of a meniscus.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not a recognized finding of neurocysticercosis on CT scans.
**Option B:** This option is incorrect because it is a common finding in other conditions, such as brain tumors or abscesses, but not specifically associated with neurocysticercosis.
**Option C:** This option is incorrect because it is a finding associated with other conditions, such as multiple sclerosis or cerebral vasculitis.
**Clinical Pearl / High-Yield Fact**
When interpreting CT scans of neurocysticercosis, it is essential to consider the patient's clinical presentation, as the appearance of the cysts can vary depending on the stage of the infection and the degree of inflammation.
**Correct Answer: D**