Least common cause of seizures in AIDS patient is?
**Core Concept**
Toxicoplasmic encephalitis is a common cause of seizures in AIDS patients, caused by reactivation of latent Toxoplasma gondii infection. However, this is not the least common cause. The correct answer will be another opportunistic infection or condition that affects the central nervous system in immunocompromised patients.
**Why the Correct Answer is Right**
The correct answer is **Cryptococcal meningitis**, which is caused by the fungus Cryptococcus neoformans. It is the least common cause of seizures in AIDS patients. Cryptococcal meningitis occurs when the fungus enters the central nervous system through the bloodstream, leading to inflammation of the meninges, which can cause seizures, altered mental status, and even death if left untreated. The fungus primarily affects individuals with severely compromised immune systems, such as those with advanced AIDS.
**Why Each Wrong Option is Incorrect**
* **Option A:** Toxoplasmosis is a common cause of seizures in AIDS patients, caused by reactivation of latent Toxoplasma gondii infection. It is not the least common cause.
* **Option B:** Cerebral lymphoma is a possible cause of seizures in AIDS patients, but it is not the least common cause.
* **Option D:** Progressive multifocal leukoencephalopathy (PML) is a rare demyelinating disease caused by the JC virus, which can cause seizures in AIDS patients. However, it is still a less common cause compared to cryptococcal meningitis.
**Clinical Pearl / High-Yield Fact**
In AIDS patients, seizures can be caused by a variety of opportunistic infections and conditions, including toxoplasmosis, cryptococcal meningitis, cerebral lymphoma, and progressive multifocal leukoencephalopathy. A high index of suspicion and prompt diagnosis are essential to treat these conditions effectively.
**Correct Answer: B. Cerebral lymphoma is a possible cause of seizures in AIDS patients, but it is not the least common cause.**