Hydrocephalus Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Hydrocephalus. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Hydrocephalus Indian Medical PG Question 1: All of the following are causes of vasogenic-type cerebral edema except which of the following?
- A. Tumors
- B. Cerebral hemorrhage
- C. Infections
- D. Hydrocephalus (Correct Answer)
Hydrocephalus Explanation: ***Hydrocephalus***
- Hydrocephalus causes interstitial edema, not vasogenic edema, due to increased **intraventricular pressure** leading to CSF extravasation into the periventricular white matter.
- This is characterized by fluid accumulation in the ventricles due to impaired **CSF flow or absorption**, rather than blood-brain barrier disruption [3].
*Tumors*
- **Brain tumors** are a common cause of vasogenic edema because they disrupt the **blood-brain barrier (BBB)**, allowing plasma proteins and fluid to leak into the extracellular space [4].
- The abnormal vasculature associated with tumors is often fenestrated, contributing to increased vascular permeability and **extracellular fluid accumulation**.
*Cerebral hemorrhage*
- Hemorrhage causes vasogenic edema by disrupting the **blood-brain barrier**, allowing blood components and fluid to leak into the surrounding brain tissue [1].
- The breakdown products of blood, such as **thrombin** and **hemoglobin**, can also directly damage endothelial cells and increase vascular permeability.
*Infections*
- Infections like **abscesses** or **meningitis** lead to vasogenic edema through inflammation, which increases the permeability of the **blood-brain barrier** [2].
- Inflammatory mediators and **bacterial toxins** can damage endothelial cells, allowing fluid and proteins to extravasate into the extracellular space.
**References:**
[1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Manifestations Of Central And Peripheral Nervous System Disease, pp. 703-704.
[2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1275-1276.
[3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Peripheral Nerves and Skeletal Muscles, pp. 1256-1257.
[4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Manifestations Of Central And Peripheral Nervous System Disease, pp. 699-700.
Hydrocephalus Indian Medical PG Question 2: A Patient falls down often with behavioral change and enuresis. What is the condition associated with him?
- A. Normal pressure hydrocephalus (NPH) (Correct Answer)
- B. Parkinson's disease (PD)
- C. Alzheimer's disease (AD)
- D. Frontotemporal dementia (FTD)
Hydrocephalus Explanation: ***Normal pressure hydrocephalus (NPH)***
- NPH is characterized by the classic triad of symptoms: **gait disturbance** (leading to falls), **dementia/behavioral changes**, and **urinary incontinence** (enuresis) [1].
- These symptoms arise from the accumulation of cerebrospinal fluid (CSF) in the brain's ventricles without a corresponding increase in intracranial pressure [2].
*Parkinson's disease (PD)*
- While PD causes **gait instability** and falls, its primary symptoms include **bradykinesia**, **rigidity**, and **resting tremor**, which are not mentioned.
- Behavioral changes can occur later in the disease, but **enuresis** is not a hallmark symptom.
*Alzheimer's disease (AD)*
- AD primarily presents with **progressive memory loss** and cognitive decline, not gait disturbances or enuresis as early or prominent features.
- Falls usually occur much later due to advanced cognitive impairment and not as an initial triad component.
*Frontotemporal dementia (FTD)*
- FTD is characterized by early and prominent **behavioral and personality changes** or language difficulties.
- While falls can occur due to executive dysfunction, **gait disturbance** and **enuresis** as part of a triad are not typical presenting features.
Hydrocephalus Indian Medical PG Question 3: What is the most common cause of hydrocephalus in children?
- A. Post inflammatory obstruction
- B. Brain tumour
- C. Perinatal injury
- D. Congenital aqueductal stenosis (Correct Answer)
Hydrocephalus Explanation: ***Congenital aqueductal stenosis***
- This is the **most common cause of hydrocephalus in children**, accounting for the majority of congenital hydrocephalus cases.
- The **cerebral aqueduct** (connecting the third and fourth ventricles) is narrowed or blocked, preventing normal CSF flow.
- Results in **obstructive hydrocephalus** with progressive ventricular enlargement.
- Clinical presentation varies from neonatal period to childhood depending on severity.
*Post inflammatory obstruction*
- An important cause of **acquired hydrocephalus**, typically following meningitis or intraventricular hemorrhage.
- Inflammation leads to **fibrosis and scarring** of CSF pathways, particularly affecting the arachnoid villi and basal cisterns.
- More common in developing countries with higher rates of CNS infections.
- While significant, it is not the overall most common cause in children.
*Brain tumour*
- Tumors can cause hydrocephalus by **obstructing CSF pathways**, particularly posterior fossa tumors blocking the fourth ventricle.
- Common tumor types include medulloblastoma, ependymoma, and cerebellar astrocytoma.
- Represents a **less common cause** compared to congenital malformations.
*Perinatal injury*
- Includes **intraventricular hemorrhage (IVH)** in premature infants and birth trauma.
- IVH can lead to post-hemorrhagic hydrocephalus through blood clot obstruction or subsequent inflammation.
- More relevant in **premature and low birth weight infants**, but not the most common cause overall.
Hydrocephalus Indian Medical PG Question 4: A 50-year-old man presents with persistent headaches, nausea, and vomiting. CT scan reveals a mass compressing the third ventricle. What is the most likely cause of his symptoms?
- A. Hydrocephalus (Correct Answer)
- B. Migraine
- C. Stroke
- D. Meningitis
Hydrocephalus Explanation: ***Hydrocephalus***
- A mass compressing the **third ventricle** obstructs the flow of **cerebrospinal fluid (CSF)**, leading to its accumulation [1] and causing **hydrocephalus**. [1]
- The classic symptoms of increased **intracranial pressure** due to hydrocephalus include persistent headaches, nausea, and vomiting. [1]
*Migraine*
- While migraines cause severe headaches, they are typically not associated with a **mass effect** or persistent nausea and vomiting directly caused by **ventricular compression**.
- **Neurological imaging** in migraine is usually normal, differentiating it from a structural lesion. [1]
*Stroke*
- Stroke symptoms are generally characterized by focal neurological deficits such as sudden weakness, sensory loss, or speech difficulties, often without a preceding history of **persistent headache** and **nausea** from a growing mass. [1]
- While strokes can cause headaches, a mass compressing the third ventricle with associated symptoms points away from an **ischemic** or **hemorrhagic** event as the primary cause.
*Meningitis*
- Meningitis involves inflammation of the **meninges**, presenting with fever, neck stiffness, and altered mental status, and is typically diagnosed via **CSF analysis**.
- A **mass compressing the third ventricle** is not a feature of meningitis, which is an infectious or inflammatory process rather than a space-occupying lesion.
Hydrocephalus Indian Medical PG Question 5: A 2-week-old female infant has a head circumference of 40 cm, which is greater than the 98th percentile, along with a large, tense fontanelle and downward deviation of the eyes. She has been vomiting her formula and is irritable. Which of the following is the least likely cause of her symptoms?
- A. Meningitis
- B. Aqueductal stenosis
- C. Brain tumor
- D. Intraventricular hemorrhage (Correct Answer)
Hydrocephalus Explanation: ***Intraventricular hemorrhage (Least Likely)***
- **Intraventricular hemorrhage (IVH)** typically occurs in **premature infants** in the **immediate perinatal period** (first few days of life), particularly in those <32 weeks gestation or <1500g birth weight.
- If severe enough to cause these pronounced symptoms (macrocephaly, tense fontanelle, sunset eyes), it would have been **diagnosed much earlier** than 2 weeks of age through clinical deterioration and routine cranial ultrasound screening.
- While post-hemorrhagic hydrocephalus can develop, the **acute presentation at 2 weeks** in a previously asymptomatic infant makes undiagnosed IVH the **least likely** cause among the options.
*Aqueductal stenosis (More Likely)*
- **Aqueductal stenosis** is the **most common cause of congenital hydrocephalus**, accounting for approximately 20% of cases.
- Obstruction of CSF flow through the cerebral aqueduct leads to progressive ventricular dilatation.
- Classic presentation includes **macrocephaly, tense fontanelle, and sunset eyes** (downward gaze deviation), typically becoming evident in the **first few weeks to months** of life as the ventricles progressively enlarge.
*Meningitis (More Likely)*
- **Neonatal meningitis** can present **acutely within the first 2-4 weeks** of life with nonspecific symptoms including irritability, vomiting, and poor feeding.
- Inflammation causes **communicating hydrocephalus** due to impaired CSF absorption at the arachnoid granulations or obstruction from inflammatory exudate.
- The **tense fontanelle** is a classic sign of increased intracranial pressure in meningitis.
*Brain tumor (More Likely)*
- While **rare in neonates**, congenital brain tumors can obstruct CSF pathways, causing **obstructive hydrocephalus**.
- Tumors such as **choroid plexus papilloma** or **teratoma** can present in the neonatal period with signs of increased intracranial pressure.
- Progressive growth can lead to **acute presentation** at 2 weeks with rapidly evolving symptoms.
Hydrocephalus Indian Medical PG Question 6: A 10 year old child presented with headache, vomiting, gait instability and diplopia. On examination he had papilledema and gait ataxia. The most probable diagnosis is –
- A. Suprasellar tumour
- B. Hydrocephalus
- C. Brain stem tumour
- D. Midline posterior fossa tumour (Correct Answer)
Hydrocephalus Explanation: ***Midline posterior fossa tumour***
- The combination of **headache, vomiting, papilledema (signs of increased intracranial pressure)**, **gait instability, and ataxia** strongly suggests a **midline posterior fossa tumor** in a child. These tumors often obstruct CSF flow, leading to hydrocephalus and cerebellar symptoms.
- Common tumors in this location in children include **medulloblastoma** and **pilocytic astrocytoma**, which frequently present with these symptoms due to their proximity to the **fourth ventricle** and **cerebellum**.
*Suprasellar tumour*
- **Suprasellar tumors** typically present with **visual field deficits** (e.g., bitemporal hemianopia) due to compression of the optic chiasm, and/or **endocrine dysfunction** (e.g., growth delay, diabetes insipidus).
- While they can cause hydrocephalus and increased intracranial pressure if large, the prominent **gait instability and ataxia** point away from a primary suprasellar lesion as the most likely cause.
*Hydrocephalus*
- **Hydrocephalus** itself explains the **increased intracranial pressure (headache, vomiting, papilledema)** and sometimes **gait instability (ataxia)**.
- However, hydrocephalus is usually a *consequence* of an underlying obstruction, and in a child presenting acutely with cerebellar dysfunction, a **tumor blocking CSF flow in the posterior fossa** is the most probable underlying cause, not hydrocephalus as the primary diagnosis.
*Brain stem tumour*
- **Brain stem tumors** typically cause **cranial nerve deficits** (e.g., facial weakness, dysphagia), **long tract signs (hemiparesis)**, and often **multiple types of ataxia**, alongside signs of increased intracranial pressure if they obstruct CSF flow.
- While gait instability and diplopia can occur, the overall picture of prominent **gait ataxia** and papilledema without other focal cranial nerve signs makes a primary midline posterior fossa tumor compressing the cerebellum and fourth ventricle more likely.
Hydrocephalus Indian Medical PG Question 7: In a patient with a metallic foreign body in the eye, which investigation should NOT be done?
- A. X-ray
- B. MRI (Correct Answer)
- C. CT
- D. USG
Hydrocephalus Explanation: ***MRI***
- **Magnetic Resonance Imaging (MRI)** is contraindicated in patients with suspected **metallic foreign bodies** in the eye.
- The powerful magnetic fields of an MRI can cause the metallic object to move, potentially leading to further **tissue damage** or even loss of vision.
*X-ray*
- **X-rays** are often the initial investigation of choice for detecting **radio-opaque foreign bodies** within the eye.
- They can effectively localize larger metallic objects and are readily available in most emergency settings.
*CT*
- **Computed Tomography (CT)** scans provide detailed cross-sectional images and are excellent for precisely localizing **intraocular foreign bodies**, especially smaller ones.
- CT can differentiate between metallic and non-metallic objects and assess for associated injuries like orbital fractures.
*USG*
- **Ultrasound (USG)** of the eye can be useful for detecting **intraocular foreign bodies**, especially if they are non-metallic or located in the posterior segment.
- It can also assess for associated complications such as **retinal detachment** or vitreous hemorrhage.
Hydrocephalus Indian Medical PG Question 8: A 5-day-old infant is diagnosed with a non-communicating hydrocephalus. Which of the following is most likely to lead to such a condition?
- A. Disturbances in the resorption of cerebrospinal fluid
- B. Excess production of cerebrospinal fluid
- C. Obstruction in the circulation of the cerebrospinal fluid (Correct Answer)
- D. Increased size of the head
Hydrocephalus Explanation: ***Obstruction in the circulation of the cerebrospinal fluid***
- **Non-communicating hydrocephalus**, by definition, is caused by an **obstruction within the ventricular system** that prevents CSF from reaching the subarachnoid space.
- In a newborn, common causes of such obstruction include **aqueductal stenosis** or malformations like **Dandy-Walker syndrome**.
*Disturbances in the resorption of cerebrospinal fluid*
- This typically leads to **communicating hydrocephalus**, where CSF can flow freely within the ventricles but is not adequately absorbed into the venous system.
- Examples include **arachnoid granulations** dysfunction or **post-meningitic scarring**.
*Excess production of cerebrospinal fluid*
- This is a very rare cause of hydrocephalus, usually associated with conditions like a **choroid plexus papilloma**.
- This would lead to a **communicating hydrocephalus** as the obstruction is not within the ventricular system itself.
*Increased size of the head*
- An **increased head size (macrocephaly)** is a *symptom* or *sign* of hydrocephalus in an infant, not a cause.
- The elevated intracranial pressure from the accumulated CSF leads to the expansion of the skull bones before the sutures fuse.
Hydrocephalus Indian Medical PG Question 9: Meningomyelocele with progressive hydrocephalus is commonly seen in
- A. Vein of Galen malformation
- B. Dandy-Walker malformation
- C. Choroid plexus papilloma
- D. Arnold-Chiari II (Correct Answer)
Hydrocephalus Explanation: ***Arnold Chiari II***
- **Arnold Chiari II malformation** is characterized by the downward displacement of the **cerebellar vermis and tonsils**, along with the brainstem, through the foramen magnum.
- This malformation is almost always associated with **meningomyelocele** and often leads to **hydrocephalus** due to obstruction of CSF flow at the level of the foramen magnum and aqueductal stenosis.
*Vein of Galen malformation*
- A **Vein of Galen malformation** is an arteriovenous malformation located in the brain, which can cause high-output cardiac failure in neonates.
- It can lead to hydrocephalus due to venous congestion but is not typically associated with **meningomyelocele**.
*Dandy-Walker malformation*
- **Dandy-Walker malformation** involves a hypoplastic or absent **cerebellar vermis**, cystic dilation of the fourth ventricle, and an enlarged posterior fossa.
- While it often presents with hydrocephalus, it is not directly associated with **meningomyelocele**.
*Choroid plexus papilloma*
- A **Choroid plexus papilloma** is a rare, benign tumor that typically causes **hydrocephalus** due to **overproduction of CSF**.
- It is not associated with **meningomyelocele** or Chiari malformations.
Hydrocephalus Indian Medical PG Question 10: In a small child diagnosed with H. influenzae meningitis, what investigation must be done before discharging him from the hospital?
- A. Hearing assessment (Correct Answer)
- B. CT scan
- C. X-ray skull
- D. MRI
Hydrocephalus Explanation: ***Hearing assessment***
- **Sensorineural hearing loss** is a significant and common complication of *H. influenzae* meningitis, occurring in up to 30% of children.
- Early detection through a **hearing assessment** is crucial for intervention and to minimize long-term developmental impact.
*CT scan*
- A CT scan is typically performed during the acute phase of meningitis to rule out complications like **hydrocephalus** or **brain abscess**, not routinely before discharge for long-term sequelae.
- While it can identify structural abnormalities, it does not directly assess **auditory function**.
*X-ray skull*
- An X-ray of the skull has very limited utility in the diagnosis or follow-up of meningitis.
- It does not provide information about brain pathology or potential **hearing damage**.
*MRI*
- MRI is a more sensitive imaging modality than CT for detecting subtle brain parenchymal changes and is sometimes used in complicated cases of meningitis.
- However, like CT, it is not the primary investigation required to assess for **hearing loss** as a post-meningitis sequela before discharge.
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