Neuropathology Practice Questions

Q: In which condition is retinal astrocytoma commonly seen?

Tuberous sclerosis. ***Tuberous sclerosis*** - **Retinal astrocytoma**, also known as **retinal astrocytic hamartoma**, is a common ocular manifestation of **tuberous sclerosis complex (TSC)** [1]. - These lesions can appear as **mulberry-like nodules** or flat, whitish patches on the retina. - Found in approximately **40-50% of patients** with tuberous sclerosis. *Sturge weber syndrome* - Characterized by a **port-wine stain (facial nevus flammeus)**, **leptomeningeal angioma**, and **glaucoma**. - Ocular manifestations include **choroidal hemangiomas** and increased episcleral venous pressure. - Does not typically involve **retinal astrocytomas**. *Von Hippel-Lindau syndrome* - Associated with **retinal capillary hemangioblastomas** (vascular tumors) and various tumors in other organs like the kidneys, pancreas, and brain. - This condition involves **vascular tumors** in the retina, not astrocytic tumors. - Important differential as it also presents with retinal lesions. *Neurofibromatosis* - A neurocutaneous syndrome characterized by **café-au-lait spots**, **neurofibromas**, and **Lisch nodules** (iris hamartomas). - Ocular manifestations include **optic nerve gliomas** and iris hamartomas, but **not retinal astrocytomas**. - NF-1 is the most common neurocutaneous syndrome but has different retinal pathology. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1318-1319.

Q: Perivascular lymphocytes & microglial nodules are seen in -

HIV encephalitis. ***HIV encephalitis*** - **Perivascular lymphocytes** and **microglial nodules** are the characteristic histopathological hallmarks of **HIV encephalitis (HIV-associated dementia complex)** [1][2]. - Microglial nodules are formed by activated microglia and macrophages, often accompanied by **multinucleated giant cells** (the classic triad) [2]. - These features reflect chronic CNS inflammation and neuronal damage caused by HIV infection. *CMV meningitis* - Cytomegalovirus (CMV) infection in immunocompromised patients causes meningoencephalitis with characteristic **intranuclear ("owl's eye") inclusion bodies** and necrotizing inflammation. - The histological pattern differs from the microglial nodules and perivascular lymphocytes seen in HIV encephalitis. *Bacterial meningitis* - Characterized by prominent **neutrophilic infiltrate** in the subarachnoid space, fibrinopurulent exudate, and potential vasculitis. - Acute bacterial meningitis does not show the lymphocytic and microglial nodular pattern characteristic of viral encephalitis. *Multiple sclerosis* - An autoimmune demyelinating disease with **perivenular demyelinating plaques** containing lymphocytes and macrophages. - While perivascular inflammation occurs, **microglial nodules** are not a characteristic feature; instead, MS shows demyelination with reactive gliosis. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, p. 1278. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Manifestations Of Central And Peripheral Nervous System Disease, pp. 711-712.

Q: Which condition is characterized by spongiform degeneration of the cerebral cortex?

Creutzfeldt-Jakob disease. ***Creutzfeldt-Jakob disease*** - This is a **prion disease** characterized by rapid cognitive decline, myoclonus, and distinctive EEG changes, with **spongiform degeneration of the cerebral cortex** as the hallmark neuropathological feature [1]. - The spongiform changes are due to intracellular vacuoles within neurons and astrocytes, giving the brain tissue a **spongy appearance** [2]. - CJD shows **widespread cortical involvement**, making it the classic answer for cortical spongiform degeneration [2]. *Subacute sclerosing panencephalitis* - This condition is a rare, **chronic, progressive encephalitis** caused by persistent measles virus infection. - It is characterized by widespread **demyelination, gliosis, and intranuclear inclusion bodies**, but not spongiform degeneration. *Fatal familial insomnia* - This is another **prion disease** that also exhibits spongiform degeneration, but the key difference is **anatomical distribution** [2]. - FFI primarily affects the **thalamus** (a subcortical structure) and causes severe insomnia, dysautonomia, and motor signs [2]. - While spongiform changes occur in FFI, they are most prominent in the **thalamus rather than the cerebral cortex**, making CJD the better answer for cortical spongiform degeneration [2]. *Cerebral toxoplasmosis* - This is an **opportunistic infection of the brain** caused by **_Toxoplasma gondii_**, primarily seen in immunocompromised individuals. - It typically results in the formation of **abscesses or ring-enhancing lesions**, rather than spongiform degeneration. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Manifestations Of Central And Peripheral Nervous System Disease, pp. 712-713. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1284-1286.

Q: What is the histological appearance of the brain in Creutzfeldt-Jakob disease?

Neuronal loss with spongiform change. ***Neuronal loss with spongiform change*** - This is the **most complete and accurate** description of CJD histology under light microscopy - The classic histological **triad** of CJD includes: (1) **spongiform vacuolation** (numerous small vacuoles in neuropil and neuronal cytoplasm), (2) **neuronal loss**, and (3) **astrocytic gliosis** [1] - This option captures the two most characteristic microscopic features that together define the disease - Spongiform change refers to the sponge-like appearance due to vacuoles, while neuronal loss with gliosis represents the degenerative process [1] *Spongiform change in brain* - While spongiform change is indeed the **hallmark feature** of CJD, this option is incomplete [1] - Describing only spongiform change without mentioning neuronal loss misses a critical component of the histological picture - In pathology, the most complete accurate description is preferred when available *Neuronal loss with gliosis* - These features are present in CJD but are **non-specific** findings - Neuronal loss and gliosis occur in many neurodegenerative diseases (Alzheimer's, Parkinson's, etc.) - Without mentioning spongiform change, this description lacks the defining characteristic of prion diseases [1] *Prion protein accumulation* - PrPSc accumulation is the **underlying cause** of the pathology, not a description of routine histological appearance - Prion proteins require **special immunohistochemical staining** (anti-PrP antibodies) for visualization [1] - Under standard H&E staining, prion deposits are not the primary visible feature; the **spongiform degeneration** is what pathologists observe [1] **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1284-1286.

Q: Which of the following tumors is not derived from the meninges?

Hemangioblastoma. ***Hemangioblastoma*** - This tumor is derived from **vascular endothelial cells and stromal cells**, not meningeal cells [1] - Typically found in the **cerebellum** and strongly associated with **von Hippel-Lindau disease** [1] - Has **no meningeal origin** and represents a distinct vascular neoplasm *Meningioma* - Derived from **arachnoidal cap cells** of the meninges [2] - Most common **benign primary intracranial tumor** arising from meningeal coverings [2] - Clearly of **meningeal origin** [3] *Schwannoma* - Originates from **Schwann cells** of peripheral nerve sheaths (neural crest origin) [4] - While not meningeal in origin, it commonly occurs **intracranially** affecting cranial nerves (especially CN VIII) [2] - Though also not meningeal, **hemangioblastoma is the better answer** as it's purely parenchymal/vascular, whereas schwannomas can have anatomic association with meninges [4] *Hemangiopericytoma* - Now classified as **solitary fibrous tumor/hemangiopericytoma** (WHO classification) - Arises from **meningeal pericytes** around blood vessels in the meninges - Despite mesenchymal origin, it is considered part of the **meningeal tumor spectrum** and has meningeal associations **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Manifestations Of Central And Peripheral Nervous System Disease, pp. 726-727. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Manifestations Of Central And Peripheral Nervous System Disease, pp. 727-728. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1316-1317. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Peripheral Nerves and Skeletal Muscles, pp. 1248-1249.

Q: An elderly patient dies with chronic dementia. At autopsy, the brain shows diffuse cortical atrophy with relative sparing of primary motor and sensory areas. Which of the following would most likely be a prominent feature on microscopic examination of her brain tissue?

Neurofibrillary tangles. ***Neurofibrillary tangles*** - Commonly associated with **Alzheimer's disease**, which can present with **chronic dementia** and shows cortical atrophy upon autopsy [1][2]. - The presence of **neurofibrillary tangles** is a hallmark feature in Alzheimer's, with relative sparing of areas like primary motor and sensory cortices [1][3]. - The number of neurofibrillary tangles correlates better with the degree of dementia than does the number of neuritic plaques [1]. *Gliosis of the caudate nucleus* - More characteristic of **Huntington's disease**, often presenting with **atrophy of the striatum** rather than cortical atrophy. - While gliosis can be present, it's not a prominent feature associated with diffuse cortical atrophy typical of Alzheimer's. *Lewy bodies* - These are typically found in **Lewy body dementia**, which presents differently and often includes **visual hallucinations** and fluctuating cognition. - This finding does not align with the chronic dementia and cortical atrophy described in the question. *Central chromatolysis* - This refers to changes seen typically in **neuronal injury**, not specifically related to chronic dementia or cortical atrophy. - It indicates a cellular response to injury, rather than the **neurodegenerative changes** noted in Alzheimer's disease. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1292-1293. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Manifestations Of Central And Peripheral Nervous System Disease, pp. 720-721. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Manifestations Of Central And Peripheral Nervous System Disease, pp. 721-722.

Q: Which of the following is not a characteristic feature of Alzheimer's disease?

Lewy bodies. ***Correct Answer: Lewy bodies*** - **Lewy bodies** are abnormal aggregates of protein, primarily **alpha-synuclein**, found in the brains of individuals with **Parkinson's disease** and **Lewy body dementia**, but **not typically in Alzheimer's disease** [1]. - While there can be overlap in pathologies, the presence of Lewy bodies as a primary feature suggests a different neurodegenerative process than Alzheimer's. - This is the correct answer because it is **NOT a characteristic feature** of Alzheimer's disease. *Incorrect: Neurofibrillary tangles* - **Neurofibrillary tangles** are intracellular aggregates of hyperphosphorylated **tau protein** and are a **hallmark pathological feature** of Alzheimer's disease. - These tangles disrupt neuronal function and axonal transport, leading to neuronal death. - This IS a characteristic feature of Alzheimer's disease. *Incorrect: Senile (neuritic) plaques* - **Senile plaques**, also known as **neuritic plaques**, are extracellular deposits of **beta-amyloid protein** that are a **characteristic pathological feature** of Alzheimer's disease. - These plaques accumulate outside neurons, leading to inflammation and neuronal dysfunction. - This IS a characteristic feature of Alzheimer's disease. *Incorrect: Amyloid Angiopathy* - **Cerebral amyloid angiopathy** (CAA) is the deposition of **amyloid-beta protein** in the walls of small and medium-sized blood vessels in the central nervous system, particularly the cerebral cortex and leptomeninges. - It is present in **over 90% of Alzheimer's disease cases** and is a significant contributor to cognitive decline and hemorrhagic events in these patients. - This IS a characteristic feature of Alzheimer's disease. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1296-1298.

Q: Complex granular corpuscles are produced by?

Microglia. ***Microglia*** - **Microglia** are the primary **immune cells** of the central nervous system (CNS) and play a key role in clearing cellular debris and pathogens. - In response to damage or infection, microglia become activated, proliferate, and can form **complex granular corpuscles** (also known as **gitter cells**), which are phagocytic cells filled with lipid-rich debris. *Oligodendrocytes* - **Oligodendrocytes** are responsible for producing **myelin** in the CNS, which insulates axons and facilitates rapid nerve impulse conduction. - They are not primarily involved in phagocytosis or the formation of granular corpuscles. *Astrocytes* - **Astrocytes** are star-shaped glial cells that provide structural and metabolic support to neurons, regulate the **blood-brain barrier**, and maintain the extracellular environment. - While they can be reactive in injury, they do not typically form phagocytic granular corpuscles like microglia. *Vascular endothelium* - **Vascular endothelial cells** form the inner lining of blood vessels, including those in the brain, and are crucial for regulating blood flow and forming the **blood-brain barrier**. - They are not considered a source of complex granular corpuscles, which are a product of intrinsic CNS immune response.

Q: Liquefactive necrosis as a primary event is most often seen in:

CNS. ***CNS*** - **Liquefactive necrosis** primarily occurs in the **central nervous system** (CNS) due to the high lipid content of brain tissue and the rapid breakdown of neurons. - It often results from **ischemia** or severe **infections**, leading to the formation of a fluid-filled cystic area [1]. *Spleen* - The spleen typically undergoes **caseous necrosis** in conditions like tuberculosis, not liquefactive necrosis. - In infarcts, it often exhibits **coagulative necrosis**, where tissue architecture remains relatively intact. *Liver* - The liver primarily exhibits **coagulative necrosis** or **steatotic changes** due to various insults such as alcohol or viral hepatitis. - **Hemorrhagic necrosis** may occur in cases of fulminant hepatic failure but is still not liquefactive. *Kidneys* - Kidneys most commonly show **coagulative necrosis** during acute tubular injury rather than liquefactive necrosis. - In renal infarcts, the tissue remains firm, and necrotic areas do not undergo liquefaction as seen in the CNS. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1268-1269.

Question 1

In which condition is retinal astrocytoma commonly seen?

Accepted Answer

Tuberous sclerosis

Answer

Sturge weber syndrome

Answer

Von Hippel-Lindau syndrome

Answer

Neurofibromatosis

Question 2

Perivascular lymphocytes & microglial nodules are seen in -

Accepted Answer

HIV encephalitis

Answer

CMV meningitis

Answer

Bacterial meningitis

Answer

Multiple sclerosis

Question 3

Which condition is characterized by spongiform degeneration of the cerebral cortex?

Accepted Answer

Creutzfeldt-Jakob disease

Answer

Subacute sclerosing panencephalitis

Answer

Fatal familial insomnia

Answer

Cerebral toxoplasmosis

Question 4

What is the histological appearance of the brain in Creutzfeldt-Jakob disease?

Accepted Answer

Neuronal loss with spongiform change

Answer

Neuronal loss with gliosis

Answer

Spongiform change in brain

Answer

Prion protein accumulation

Question 5

Which of the following tumors is not derived from the meninges?

Accepted Answer

Hemangioblastoma

Answer

Meningioma

Answer

Hemangiopericytoma

Answer

Schwannoma

Question 6

An elderly patient dies with chronic dementia. At autopsy, the brain shows diffuse cortical atrophy with relative sparing of primary motor and sensory areas. Which of the following would most likely be a prominent feature on microscopic examination of her brain tissue?

Accepted Answer

Neurofibrillary tangles

Answer

Central chromatolysis

Answer

Lewy bodies

Answer

Gliosis of the caudate nucleus

Question 7

Which of the following is not a characteristic feature of Alzheimer's disease?

Accepted Answer

Lewy bodies

Answer

Neurofibrillary tangles

Answer

Senile (neuritic) plaques

Answer

Amyloid Angiopathy

Question 8

Complex granular corpuscles are produced by?

Accepted Answer

Microglia

Answer

Oligodendrocytes

Answer

Astrocytes

Answer

Vascular endothelium

Question 9

Which of the following lesions shows the most specific anatomic changes in HIV infection?

Accepted Answer

CNS lesions

Answer

Lymph nodes

Answer

Kaposi's sarcoma

Answer

Opportunistic infection

Question 10

Liquefactive necrosis as a primary event is most often seen in:

Accepted Answer

CNS

Answer

Kidneys

Answer

Spleen

Answer

Liver

Neuropathology — MCQs

Neuropathology — MCQs

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