Neuro-oncology Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Neuro-oncology. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Neuro-oncology Indian Medical PG Question 1: Signs of increased intracranial tension are all except:
- A. Headache
- B. Seizures
- C. Papilledema
- D. Tachycardia (Correct Answer)
Neuro-oncology Explanation: ***Tachycardia***
- **Tachycardia** is generally *not* a sign of increased intracranial pressure (ICP); rather, **bradycardia** (Cushing's reflex) is a classic finding.
- While other systemic responses may occur, a direct, consistent increase in heart rate due to elevated ICP is uncommon.
*Papilledema*
- **Papilledema** is a swelling of the **optic disc** due to increased ICP, a critical diagnostic sign [1].
- The increased pressure impedes venous return from the retina, causing the optic nerve head to bulge.
*Headache*
- **Headache** is a common and often early symptom of increased ICP due to the stretching of pain-sensitive meningeal and vascular structures [1].
- It is typically described as a dull, throbbing pain, often worse in the morning or with straining.
*Seizures*
- **Seizures** can result from increased ICP as the pressure on brain tissue can lead to electrical instability and abnormal neuronal discharge [2].
- This symptom indicates significant cortical irritation or dysfunction caused by the elevated pressure.
Neuro-oncology Indian Medical PG Question 2: Which mutation is characteristic of oligodendroglioma?
- A. BRAF V600E
- B. IDH1 mutation alone
- C. EGFR amplification
- D. 1p19q codeletion (Correct Answer)
Neuro-oncology Explanation: ***1p19q codeletion***
- The **codeletion of chromosomal arms 1p and 19q** is a molecular hallmark of oligodendroglioma and is crucial for diagnosis according to WHO classification [1].
- This specific genetic alteration is associated with **better prognosis** and increased responsiveness to chemotherapy and radiation in patients with oligodendroglioma.
*BRAF V600E*
- The **BRAF V600E mutation** is commonly found in **pleomorphic xanthoastrocytoma (PXA)** and **ganglioglioma**, but not typically in oligodendroglioma.
- It is also characteristic of other cancers like **melanoma** and some **thyroid cancers**.
*IDH1 mutation alone*
- While an **IDH1 mutation** is present in most oligodendrogliomas, it is usually accompanied by the **1p19q codeletion** [1]. Isolated IDH1 mutation without 1p19q codeletion suggests other diffuse gliomas, such as astrocytoma.
- An isolated IDH1 mutation is more characteristic of **IDH-mutant astrocytoma**, especially when 1p19q is intact.
*EGFR amplification*
- **EGFR amplification** is a classic genetic alteration found in **glioblastoma (GBM)**, a highly aggressive primary brain tumor [2].
- It is rarely seen in oligodendrogliomas and is associated with a **worse prognosis** in GBM.
**References:**
[1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1311-1312.
[2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1308-1310.
Neuro-oncology Indian Medical PG Question 3: Which of the following statements about cerebellar astrocytomas in pediatric age group is false:
- A. These tumors are more common in females (Correct Answer)
- B. These are usually low grade tumors
- C. These are more commonly seen in the 1st and 2nd decades
- D. These tumors have a good prognosis
Neuro-oncology Explanation: ***These tumors are more common in females***
- **Cerebellar astrocytomas** generally show a slight male predominance or an equal sex distribution in the pediatric age group [2].
- Making the statement that they are more common in females **false**, and thus the correct answer as the question asks for the false statement.
*These are usually low grade tumors*
- **Cerebellar astrocytomas** in children are typically **low-grade astrocytomas (WHO grade I or II)**, particularly **pilocytic astrocytomas** [1], [2].
- This characteristic contributes significantly to their generally favorable prognosis.
*These are more commonly seen in the 1st and 2nd decades*
- **Cerebellar astrocytomas** are one of the most common brain tumors in children and adolescents, with the highest incidence occurring in the **first and second decades of life** [1], [2].
- They are often diagnosed in children between **5 and 15 years old**.
*These tumors have a good prognosis*
- Due to their **low-grade nature** and often **cystic appearance** with a resectable mural nodule, **pilocytic astrocytomas**—the most common type of cerebellar astrocytoma in children—have a **very good prognosis** after gross total resection.
- The 5-year survival rate can exceed **90%** for completely resected tumors.
**References:**
[1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1319-1320.
[2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Manifestations Of Central And Peripheral Nervous System Disease, pp. 725-726.
Neuro-oncology Indian Medical PG Question 4: What is the most common cerebellar tumor in children?
- A. Ependymoma
- B. Medulloblastoma (Correct Answer)
- C. PNET
- D. Astrocytoma
Neuro-oncology Explanation: ***Medulloblastoma***
- **Medulloblastoma** is the most common **malignant** cerebellar tumor in children, accounting for about 20% of all childhood brain tumors [2].
- In the context of this question, medulloblastoma is considered the "most common cerebellar tumor" as it is the most frequently encountered **malignant** tumor requiring aggressive treatment.
- These tumors arise from neuroectodermal cells in the cerebellum and are typically **highly aggressive**, often spreading through the cerebrospinal fluid (CSF) pathways [1], [2].
- Peak incidence is between 5-9 years of age, with a male predominance [1].
*Astrocytoma*
- **Cerebellar pilocytic astrocytomas** are actually the most common **benign** cerebellar tumor in children and represent a significant portion of all cerebellar tumors [1].
- However, in competitive exam contexts, when asking about "most common cerebellar tumor," the question typically refers to **malignant tumors**, where medulloblastoma takes precedence.
- **Pilocytic astrocytomas** are usually low-grade (WHO Grade I) and have an excellent prognosis, often presenting as cystic lesions with a mural nodule.
*Ependymoma*
- **Ependymomas** are the third most common posterior fossa tumor in children (after medulloblastoma and pilocytic astrocytoma).
- They typically arise from the ependymal lining of the **fourth ventricle**, making them cerebellar-adjacent rather than primarily cerebellar tumors [3], [4].
- They account for about 10% of pediatric brain tumors and have an intermediate prognosis.
*PNET*
- **PNET (Primitive Neuroectodermal Tumor)** is a historical term that has largely been replaced by more specific classifications in the current WHO CNS tumor classification.
- Medulloblastoma was previously classified as a type of PNET, but is now recognized as a distinct entity.
- The term PNET is now rarely used in modern neuropathology practice, having been superseded by molecular and genetic classification systems.
**References:**
[1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Manifestations Of Central And Peripheral Nervous System Disease, pp. 725-726.
[2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1314-1315.
[3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Manifestations Of Central And Peripheral Nervous System Disease, pp. 726-727.
[4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1312-1313.
Neuro-oncology Indian Medical PG Question 5: Which of the following is the most common tumor of the brain?
- A. Cerebral metastasis (Correct Answer)
- B. Meningioma
- C. Glioma
- D. Pituitary adenoma
Neuro-oncology Explanation: ***Cerebral metastasis***
- **Cerebral metastases** are the most common type of brain tumor overall, significantly outnumbering all primary brain tumors combined [1].
- They originate from cancers elsewhere in the body (most commonly **lung, breast, melanoma, renal, and colorectal carcinomas**) and spread to the brain via the bloodstream [1].
- Metastases typically occur at the **gray-white matter junction** and are often **multiple**.
*Meningioma*
- **Meningiomas** are the most common *primary* **benign** brain tumors, originating from arachnoid cap cells of the meninges [2].
- They account for ~30% of primary intracranial tumors but are still less frequent than metastatic brain tumors overall.
- More common in **middle-aged females** and typically slow-growing [2].
*Glioma*
- **Gliomas** are common *primary* **malignant** brain tumors, arising from glial cells (astrocytes, oligodendrocytes, or ependymal cells) [3].
- **Glioblastoma** is the most common primary malignant brain tumor in adults, but all gliomas combined are still less common than metastatic brain lesions overall.
*Pituitary adenoma*
- **Pituitary adenomas** are common benign tumors of the sellar region, accounting for ~10-15% of intracranial tumors.
- While frequent among primary tumors, they are less common than metastatic brain lesions overall.
**References:**
[1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1317-1318.
[2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1316-1317.
[3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Manifestations Of Central And Peripheral Nervous System Disease, pp. 725-726.
Neuro-oncology Indian Medical PG Question 6: Which of the following statements about meningiomas is true?
- A. Approximately 5% of meningiomas are malignant.
- B. Arise from the dural layer
- C. Meningiomas are more common in women due to hormonal influences.
- D. 95% cure rate following total surgical resection of benign meningiomas (Correct Answer)
Neuro-oncology Explanation: ***95% cure rate following treatment***
- Meningiomas generally have a **high cure rate of approximately 95%** following surgical resection, especially when they are completely excised [1].
- They are typically **benign tumors**, resulting in favorable outcomes with appropriate management [1].
*Arise from arachnoid layer*
- Meningiomas actually arise from **meningothelial cells** of the **arachnoid layer**, but this statement does not fully explain their pathogenesis.
- This mischaracterization does not provide an accurate understanding of the tumor's origin and biology.
*50% are malignant*
- Most meningiomas are benign; only a small percentage, about **1-5%**, are classified as malignant.
- Thus, stating that **50% are malignant** significantly overestimates the incidence of aggressive forms.
*More common in men*
- Meningiomas are more prevalent in **women**, especially those aged between 30-70 years, with a female-to-male ratio of approximately **3:1**.
- This option is incorrect as it misrepresents the demographic distribution of the disease.
**References:**
[1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1316-1317.
Neuro-oncology Indian Medical PG Question 7: Which of the following statements about astrocytoma is false?
- A. Low grade tumors are more common in children
- B. These are mostly infratentorial in children
- C. Pilocytic astrocytoma is most common childhood brain tumor
- D. They are more common in males than females (Correct Answer)
Neuro-oncology Explanation: ***They are more common in males than females***
- This statement is **false** because, while specific types of astrocytomas might show slight sex predominance, astrocytomas as a whole do not consistently show a significantly higher incidence in males compared to females. [1]
- The incidence of astrocytomas is generally considered to be **roughly equal** between sexes or with only minor, inconsistent differences depending on the specific subtype and age group.
*Low grade tumors are more common in children*
- This statement is **true** because pediatric gliomas, including astrocytomas, are predominantly **low-grade (WHO grade I or II)**, accounting for about half of all central nervous system tumors in children. [2]
- **Pilocytic astrocytoma (WHO grade I)** is a common example, known for its slow growth and often favorable prognosis. [2]
*These are mostly infratentorial in children*
- This statement is **true** as astrocytomas in children frequently occur in the **infratentorial region**, particularly the cerebellum, brainstem, and optic pathways. [1], [2]
- This contrasts with adults, where supratentorial locations are more common; **cerebellar astrocytoma** is a classic example in children. [1]
*Pilocytic astrocytoma is most common childhood brain tumor*
- This statement is **true** as **pilocytic astrocytoma (WHO grade I)** is indeed the most common type of pediatric primary brain tumor, accounting for a significant proportion of all childhood CNS neoplasms. [2]
- It often presents as a **cystic lesion with a mural nodule** and has a relatively good prognosis compared to higher-grade astrocytomas.
**References:**
[1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Manifestations Of Central And Peripheral Nervous System Disease, pp. 725-726.
[2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1319-1320.
Neuro-oncology Indian Medical PG Question 8: Pseudotumor cerebri is most commonly seen in:
- A. Thin built males in the age group 50-60 years
- B. Obese females in the age group 20-45 years (Correct Answer)
- C. Obese males in the age group 20-45 years
- D. Thin built females in the age group 50-60 years
Neuro-oncology Explanation: ***Obese females in the age group 20-45 years***
- **Pseudotumor cerebri** (also known as **idiopathic intracranial hypertension**) is most commonly observed in **obese women** of childbearing age (typically 20-45 years) [1].
- This demographic has the highest incidence, often associated with a higher **body mass index (BMI)** [1].
*Thin built males in the age group 50-60 years*
- This demographic is **not typically associated** with pseudotumor cerebri, which has a strong predilection for obese females [1].
- While pseudotumor cerebri can rarely occur in males, it is less common and usually not in this specific age and body habitus group.
*Obese males in the age group 20-45 years*
- While **obesity** is a risk factor, pseudotumor cerebri is far **less common in males** than in females, even with similar age and BMI [1].
- The prevalence in obese men is significantly lower compared to obese women.
*Thin built females in the age group 50-60 years*
- This demographic is generally at **low risk** for pseudotumor cerebri.
- The condition is predominantly seen in younger, obese women, and older age and thin build are not characteristic risk factors [1].
Neuro-oncology Indian Medical PG Question 9: Which of the following CNS tumor shows increased growth during pregnancy?
- A. Oligodendroglioma
- B. Meningioma (Correct Answer)
- C. Craniopharyngioma
- D. Glioblastoma Multiforme
Neuro-oncology Explanation: ***Meningioma***
- **Meningiomas** often express receptors for **estrogen** and **progesterone**, leading to increased growth rates during the **estrogen-rich environment of pregnancy**.
- This tumor's growth during pregnancy can exacerbate neurological symptoms or lead to the discovery of previously asymptomatic meningiomas.
*Oligodendroglioma*
- **Oligodendrogliomas** are a type of glioma that do not typically show an increased growth rate in response to hormonal changes during pregnancy.
- Their growth is generally independent of **sex hormones**, and their progression is determined by other genetic and molecular factors.
*Craniopharyngioma*
- **Craniopharyngiomas** are benign epithelial tumors that arise from Rathke's pouch remnants and primarily affect children, though they can occur in adults.
- Their growth is not significantly influenced by **hormonal changes** related to pregnancy.
*Glioblastoma Multiforme*
- **Glioblastoma multiforme (GBM)** is a highly aggressive and fast-growing primary brain tumor, but its growth is not directly stimulated by the hormonal changes of pregnancy.
- While GBM can rapidly progress during pregnancy, this is due to its inherent aggressive nature rather than hormonal effects on tumor cells.
Neuro-oncology Indian Medical PG Question 10: In acoustic neuroma, which cranial nerve is involved earliest?
- A. CN V
- B. CN VII
- C. CN VIII (Correct Answer)
- D. CN X
Neuro-oncology Explanation: ***CN VIII***
- An **acoustic neuroma** (also known as a **vestibular schwannoma**) originates from the **Schwann cells** of the **vestibulocochlear nerve (CN VIII)**.
- Due to its origin, symptoms related to **hearing loss**, **tinnitus**, and **balance issues** (all functions of CN VIII) are typically the earliest to manifest [1].
*CN V*
- The **trigeminal nerve (CN V)** is responsible for **facial sensation** and **mastication**.
- Compression of CN V usually occurs in later stages of acoustic neuroma growth, leading to **facial numbness** or **pain**.
*CN VII*
- The **facial nerve (CN VII)** controls **facial expressions** and taste sensation in the anterior two-thirds of the tongue.
- **Facial weakness** or **paralysis** due to CN VII involvement typically occurs after significant tumor growth, as the nerve runs adjacent to the acoustic neuroma [1].
*CN X*
- The **vagus nerve (CN X)** is involved in diverse functions including **swallowing**, **speech**, and **autonomic regulation** of organs like the heart and digestive tract.
- **Vagal nerve** symptoms such as **dysphagia** or **hoarseness** are extremely rare in acoustic neuromas and would indicate a very extensive tumor likely compressing structures much more distant from the primary site.
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