A 32 year old soldier is brought to casualty after a generalised seizure. After awakening he gives history of loss of consciousness twice in the past 2 years. He is otherwise healthy and general physical examination reveals no abnormalities. CT scan with contrast reveals two small hyperintense foci in the right frontal lobe , as well as a 1cm cystic lesion with a nodular focus within it in the left frontal region. The cyst wall of the latter enhances with contrast. The two right lesions do not enhance. The most likely diagnosis?

## **Core Concept**
The question tests knowledge of neuroimaging findings and their correlation with neurological conditions, specifically those that cause seizures and are visible on CT scans with contrast. The key concepts here involve understanding the characteristics of various types of brain lesions, including their appearance on imaging and their clinical implications.

## **Why the Correct Answer is Right**
The description provided suggests the presence of two distinct types of lesions: two small, non-enhancing hyperintense foci in the right frontal lobe and a 1cm cystic lesion with a nodular focus in the left frontal region, whose cyst wall enhances with contrast. The presence of a cystic lesion with a nodular component that enhances with contrast is highly suggestive of **Neurocysticercosis (NCC)**, a parasitic infection caused by the pork tapeworm (Taenia solium). NCC can present with a variety of lesions at different stages of the disease, including colloidal vesicular, granular nodular, and calcified stages. The enhancing wall and nodular component are characteristic of the colloidal vesicular or granular nodular stages.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is not provided, but assuming it's a plausible alternative diagnosis, we can infer that any option not suggesting NCC would need to be ruled out based on the imaging characteristics and clinical presentation.
- **Option B:** Similarly, without the specific text, we can deduce that any diagnosis not aligning with the described imaging findings and clinical scenario would be incorrect.
- **Option D:** Again, without specifics, we focus on why NCC is the likely diagnosis based on provided details.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **Neurocysticercosis** is a leading cause of acquired epilepsy in developing countries but can also be seen in travelers or immigrants from endemic areas. The disease can present with seizures, headaches, and other neurological symptoms, depending on the location and number of lesions. Imaging findings, as described, are critical for diagnosis.

## **Correct Answer: C.**

✓ Correct Answer: C. Neurocysticercosis