Which Neurocysticercosis type develops cysticerci in areas such as subarachnoid space, meninges, ventricles, spine, or eyes?

Which Neurocysticercosis type develops cysticerci in areas such as subarachnoid space, meninges, ventricles, spine, or eyes?

• A. Extraparenchymal
• B. Parenchymal
• C. Intraparenchymal
• D. Intracranial

Answer: (A)

Cysticerci located outside the brain tissue are termed extraparenchymal. The areas listed—subarachnoid space, meninges, ventricles, spine, or eyes—are CSF-containing spaces or ocular/spinal tissues, not the brain parenchyma itself. So when cysticerci develop in these compartments, it’s extraparenchymal neurocysticercosis. This helps explain why such cases can cause hydrocephalus or meningitis-like symptoms from CSF flow obstruction, and why ocular involvement requires different management. Parenchymal disease, by contrast, involves cysts within the brain tissue and has a different clinical pattern, such as seizures.

Cysticerci located outside the brain tissue are termed extraparenchymal. The areas listed—subarachnoid space, meninges, ventricles, spine, or eyes—are CSF-containing spaces or ocular/spinal tissues, not the brain parenchyma itself. So when cysticerci develop in these compartments, it’s extraparenchymal neurocysticercosis. This helps explain why such cases can cause hydrocephalus or meningitis-like symptoms from CSF flow obstruction, and why ocular involvement requires different management. Parenchymal disease, by contrast, involves cysts within the brain tissue and has a different clinical pattern, such as seizures.