Neuropathology Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Neuropathology. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Neuropathology Indian Medical PG Question 1: Which of the following is the most prominent clinical characteristic of Alzheimer's disease?
- A. Memory loss (Correct Answer)
- B. Neurofibrillary tangles
- C. Amyloid plaques
- D. Resting tremor
Neuropathology Explanation: ***Memory loss***
- **Memory loss**, particularly of recent events (anterograde amnesia), is the **earliest and most prominent clinical symptom** of Alzheimer's disease.
- This is a **clinical characteristic** - an observable symptom experienced by the patient and noted by clinicians during evaluation.
- The memory deficit progressively worsens, initially affecting **short-term recall** and learned information, eventually extending to long-term memory and significantly impacting daily functioning.
*Neurofibrillary tangles*
- **Neurofibrillary tangles**, composed of hyperphosphorylated tau protein, are a **pathological hallmark** found in the brains of Alzheimer's patients at autopsy or biopsy.
- These are **microscopic findings**, not a clinical characteristic - they cannot be observed directly by the patient or clinician during clinical evaluation.
- Essential for definitive neuropathological diagnosis but not a clinical symptom.
*Amyloid plaques*
- **Amyloid plaques** (senile plaques), formed by aggregation of beta-amyloid peptides, are another **pathological hallmark** of Alzheimer's disease.
- Like neurofibrillary tangles, these are **microscopic neuropathological findings**, not observable clinical symptoms.
- They represent the underlying disease pathology but not the clinical presentation.
*Resting tremor*
- A **resting tremor** is a cardinal motor symptom of **Parkinson's disease**, not Alzheimer's disease.
- While some patients with advanced Alzheimer's may develop motor symptoms, resting tremor is **not a characteristic or prominent feature** of Alzheimer's disease.
- This option tests knowledge of differential diagnosis between neurodegenerative disorders.
Neuropathology Indian Medical PG Question 2: False regarding Alzheimer's disease (AD) is:
- A. Number of neurofibrillary tangles is associated with the severity of dementia
- B. Number of senile (neuritic) plaques correlates (increases) with age
- C. Presence of tau protein suggest neurodegeneration
- D. Extracellular inclusion (lesion) can occur in the absence of intracellular inclusions to make pathological diagnosis of AD (Correct Answer)
Neuropathology Explanation: ***Extracellular inclusion (lesion) can occur in the absence of intracellular inclusions to make pathological diagnosis of AD***
- A definitive pathological diagnosis of **Alzheimer's disease** requires both the presence of **extracellular amyloid plaques** and **intracellular neurofibrillary tangles** [1].
- Neither inclusion type alone is sufficient for the diagnosis, as amyloid plaques can be found in non-demented elderly individuals [1].
*Number of neurofibrillary tangles is associated with the severity of dementia*
- The **density and distribution of neurofibrillary tangles** (NFTs) directly correlate with the severity of cognitive impairment and **dementia** in AD [1].
- Tangles are composed of hyperphosphorylated **tau protein** and disrupt neuronal function, leading to neurodegeneration [2].
*Number of senile (neuritic) plaques correlates (increases) with age*
- The accumulation of **senile (neuritic) plaques**, composed primarily of **beta-amyloid protein**, generally increases with age, even in cognitively normal individuals [1].
- While plaques are a hallmark of AD, their mere presence is not always diagnostic of clinical dementia [1].
*Presence of tau protein suggest neurodegeneration*
- The presence of **hyperphosphorylated tau protein**, especially when forming **neurofibrillary tangles**, is a strong indicator of **neurodegeneration** [2].
- **Tauopathy** is a key pathological feature in AD and other neurodegenerative diseases [1].
**References:**
[1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1292-1294.
[2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Manifestations Of Central And Peripheral Nervous System Disease, pp. 721-722.
Neuropathology Indian Medical PG Question 3: Which of the following is not a feature of apoptosis?
- A. Membrane blebbing
- B. Inflammation (Correct Answer)
- C. DNA fragmentation
- D. Cell shrinkage
Neuropathology Explanation: ***Inflammation***
- **Apoptosis** is a programmed cell death process that does not typically induce an inflammatory response because the cellular contents are neatly packaged and cleared by phagocytes without spilling into the surrounding tissue [1].
- Unlike **necrosis**, apoptosis is considered a "clean" form of cell death that avoids triggering immune reactions [1].
*Membrane blebbing*
- **Membrane blebbing** is a characteristic morphological change observed during apoptosis, where the cell membrane forms irregular buds or protrusions.
- This process helps in the formation of **apoptotic bodies**, which are then readily phagocytosed [1].
*DNA fragmentation*
- **DNA fragmentation** into nucleosome-sized units (180-200 base pairs) is a hallmark of apoptosis, mediated by **caspase-activated DNases** [2].
- This ensures the orderly breakdown of the genetic material as part of the cell's self-destruction program.
*Cell shrinkage*
- **Cell shrinkage** and condensation of the cytoplasm and nucleus are early and prominent features of apoptosis.
- This reduction in cell volume occurs as water and ions are extruded from the cell, contributing to the formation of condensed apoptotic bodies.
**References:**
[1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, pp. 67-69.
[2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, pp. 64-65.
Neuropathology Indian Medical PG Question 4: Which of the following drugs is preferred in the management of primary progressive multiple sclerosis?
- A. Natalizumab
- B. Ocrelizumab (Correct Answer)
- C. Alemtuzumab
- D. Fingolimod
Neuropathology Explanation: ***Ocrelizumab***
- **Ocrelizumab** is the first and only FDA-approved disease-modifying therapy for **primary progressive multiple sclerosis (PPMS)**, demonstrating a reduction in disability progression.
- It is a **monoclonal antibody** that selectively targets CD20-positive B cells, believed to play a critical role in the pathogenesis of MS.
*Natalizumab*
- **Natalizumab** is approved for **relapsing-remitting multiple sclerosis (RRMS)**, not primary progressive MS [1].
- It works by blocking the migration of immune cells into the **central nervous system**, but carries a risk of **progressive multifocal leukoencephalopathy (PML)**.
*Alemtuzumab*
- **Alemtuzumab** is used for **relapsing forms of MS**, particularly in patients who have had an inadequate response to other MS drugs [1].
- It is known for its durable efficacy but also its significant side effects, including **autoimmune conditions** and **infusion reactions**.
*Fingolimod*
- **Fingolimod** is an oral medication approved for **relapsing forms of MS**, but not for primary progressive MS [1].
- It acts by trapping lymphocytes in the **lymph nodes**, preventing them from entering the central nervous system.
Neuropathology Indian Medical PG Question 5: Subcortical dementia is seen in all except :
- A. Wilson's disease
- B. Alzheimer's disease (Correct Answer)
- C. Huntington's Chorea
- D. Parkinsonism
Neuropathology Explanation: ***Alzheimer's disease***
- Alzheimer's disease is primarily a **cortical dementia**, characterized by the impairment of higher cognitive functions like memory, language, and executive function due to degeneration of the cerebral cortex [1].
- While it can later affect subcortical structures, its hallmark features are related to cortical pathology, such as **neurofibrillary tangles** and amyloid plaques primarily in cortical regions [1].
*Wilson's disease*
- Wilson's disease is a genetic disorder of **copper metabolism** that leads to copper accumulation in the brain, liver, and other organs.
- The basal ganglia, a key subcortical structure, is particularly vulnerable to copper toxicity, leading to prominent **movement disorders** and **subcortical dementia**.
*Huntington's Chorea*
- Huntington's disease is a progressive neurodegenerative disorder characterized by the degeneration of neurons in the **basal ganglia** (especially the striatum) and cerebral cortex.
- The significant involvement of the basal ganglia leads to the characteristic **chorea** and **subcortical dementia** with cognitive slowing and executive dysfunction.
*Parkinsonism*
- Parkinsonism, particularly Parkinson's disease, is characterized by the degeneration of dopaminergic neurons in the **substantia nigra pars compacta**, a subcortical structure.
- This leads to motor symptoms and frequently also to **subcortical executive dysfunction** and slower processing speed, consistent with a subcortical dementia.
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