MONRO’s abscess are seen in
**Core Concept**
Monro's abscess refers to the accumulation of cerebrospinal fluid (CSF) in the lateral ventricles of the brain, leading to increased intracranial pressure. This condition is often associated with obstructive hydrocephalus, where the normal flow of CSF is blocked.
**Why the Correct Answer is Right**
Monro's abscess occurs when there is an obstruction in the cerebral aqueduct or the fourth ventricle, causing the CSF to accumulate in the lateral ventricles. This leads to an increase in intracranial pressure, which can be life-threatening if left untreated. The condition is named after Scottish surgeon Alexander Monro, who first described it in the 18th century.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Monro's abscess is not associated with a decrease in CSF production, but rather an obstruction in the flow of CSF.
**Option B:** This option is incorrect because Monro's abscess is not caused by a tumor in the brain, although tumors can cause obstructive hydrocephalus.
**Option C:** This option is incorrect because Monro's abscess is not a type of meningitis, which is an inflammation of the protective membranes covering the brain and spinal cord.
**Clinical Pearl / High-Yield Fact**
Monro's abscess is a classic example of a condition that requires prompt medical attention to prevent further complications, including brain herniation and death.
**Correct Answer:** C.