Which structure is used as a landmark for intracranial pressure monitoring?

• A. Choroid Plexus Structures
• B. Foramen of Monro
• C. Lateral Ventricles
• D. Blood-Brain Barrier

Answer: (B)

The key idea is how clinicians guide an intracranial pressure catheter into the ventricular system. For reliable ICP monitoring, the catheter is placed into the lateral ventricle, and the most dependable anatomical reference point to aim for is the foramen of Monro—the opening that connects the lateral ventricle to the third ventricle. By directing the catheter toward the frontal horn of the lateral ventricle near this foramen, you ensure the tip sits inside a ventricular chamber rather than the brain tissue, giving accurate pressure readings and allowing CSF drainage if needed. The choroid plexus is involved in CSF production but isn’t used as a guiding landmark; the lateral ventricles themselves are the target, not the landmark; and the blood-brain barrier isn’t relevant to catheter placement.