Neurology Practice Questions

Q: What is Prosopagnosia?

Difficulty in identifying known faces. ***Difficulty in identifying known faces*** - **Prosopagnosia**, also known as **face blindness**, is a neurological disorder characterized by an inability to recognize familiar faces. - Individuals with prosopagnosia may have trouble recognizing even close family members or their own reflection, despite having intact vision and general intellectual function. - This is a specific type of agnosia limited to face recognition. *Impairment of consciousness* - Impairment of consciousness refers to a reduced state of awareness or responsiveness, often seen in conditions like coma or delirium. - This is a broad neurological state and does not specifically describe the inability to recognize faces. *Being unaware of one's problems* - This symptom is known as **anosognosia**, which is a lack of insight into one's own neurological deficits or illness. - Anosognosia is a problem of self-awareness, not specifically face recognition. *Failure to identify objects* - The inability to identify objects is a form of **agnosia**, specifically **associative visual agnosia** if the person can see the object but not recognize it. - While prosopagnosia is a type of agnosia, it is highly specific to faces, whereas object agnosia refers to a broader failure in object recognition.

Q: Thrombosis of posterior inferior cerebellar artery causes:

Lateral Medullary Syndrome (Wallenberg's syndrome). ***Lateral Medullary Syndrome (Wallenberg's syndrome)*** - Thrombosis of the **posterior inferior cerebellar artery (PICA)** is the most common cause of **Lateral Medullary Syndrome**, also known as Wallenberg's syndrome. - This syndrome is characterized by a constellation of symptoms including **dysphagia**, **hoarseness** [2], **ataxia**, **vertigo**, **Horner's syndrome** [3], and ipsilateral facial/contralateral body **sensory loss**. *Weber's syndrome* - Weber's syndrome results from an **occlusion of paramedian branches of the posterior cerebral artery**, affecting the **midbrain**. - It is characterized by **ipsilateral oculomotor nerve palsy** and **contralateral hemiplegia** or hemiparesis [1]. *No effect* - Thrombosis of an artery, especially one supplying a critical brain region like the **brainstem**, will always have a significant effect due to **ischemia** and subsequent damage to neural structures. - The PICA supplies crucial areas of the **lateral medulla** and **inferior cerebellum**, making a "no effect" outcome highly improbable. *Medial Medullary Syndrome* - Medial Medullary Syndrome typically results from an **occlusion of the vertebral artery** or its **medial medullary branches**. - Symptoms include **contralateral hemiparesis** (affecting the arm and leg), **ipsilateral tongue deviation**, and **contralateral loss of proprioception and vibratory sense**.

Q: Which of the following statements about Weber’s syndrome is incorrect?

Weber's syndrome involves the anterior cerebral artery.. ***Weber's syndrome involves the anterior cerebral artery.*** - **Weber's syndrome** is caused by a lesion in the **midbrain**, typically affecting the paramedian branches of the **posterior cerebral artery** that supply this region, not the anterior cerebral artery. - The **anterior cerebral artery** supplies parts of the frontal and parietal lobes and the corpus callosum, and its occlusion would lead to different neurological deficits, such as contralateral leg weakness. *Ipsilateral Oculomotor nerve palsy is a feature of Weber's syndrome.* - This statement is **correct**. **Weber's syndrome** specifically involves damage to the **oculomotor nerve fascicles** as they traverse the midbrain. - Damage to the oculomotor nerve causes **ipsilateral oculomotor nerve palsy**, characterized by a dilated pupil and ophthalmoplegia [2]. *Contralateral Parkinsonism is a feature of Weber's syndrome.* - This statement is **incorrect** as **Parkinsonism** is not a feature of **Weber's syndrome**. - **Weber's syndrome** typically involves the **cerebral peduncle**, leading to **contralateral hemiplegia**, not Parkinsonism. *Contralateral hemiplegia is a feature of Weber's syndrome.* - This statement is **correct**. The lesion in **Weber's syndrome** typically affects the **corticospinal tracts** within the **cerebral peduncle** at the level of the midbrain. - Damage to these descending motor pathways results in **contralateral hemiplegia** or hemiparesis, affecting the limbs on the opposite side of the body from the lesion [1].

Q: What is the earliest feature of 3rd cranial nerve involvement in a patient with diabetes mellitus?

Ptosis or diplopia. **Ptosis or diplopia** - In diabetic neuropathy affecting the **oculomotor nerve (CN III)**, the **parasympathetic fibers** responsible for pupillary constriction are typically spared initially [3]. - **Ischemic damage** primarily affects the somatic motor fibers, leading to weakness of the extraocular muscles supplied by CN III, resulting in **ptosis** (due to levator palpebrae superioris weakness) and **diplopia** (due to misalignment of the eyes) [1]. *Normal light reflex* - A normal light reflex indicates that the **parasympathetic fibers** (which control pupillary constriction) are intact, which is often the case in early diabetic CN III palsies [2]. - While the light reflex remains normal, other CN III palsy symptoms like ptosis and diplopia will already be evident [1]. *Abnormal light reflex* - An abnormal light reflex (dilated pupil) suggests involvement of the **parasympathetic fibers**, which is less common in the *earliest stages* of diabetic CN III neuropathy [2]. - When an abnormal light reflex is present, it often points to a **compressive lesion** rather than an ischemic one, making it a later or atypical feature in diabetes [2]. *Eye pain* - **Pain** can accompany CN III palsies, especially in diabetic neuropathy, due to involvement of nearby sensory fibers. - However, pain is a **subjective symptom** and not the *earliest physical sign* that objectively indicates the specific dysfunction of the CN III motor pathway.

Q: What is the first symptom of Parkinson's disease?

Tremors. ***Tremors*** - A resting **tremor**, often starting unilaterally in a hand or foot, is frequently the **initial motor symptom** of Parkinson's disease [1]. - This tremor is typically **slow**, rhythmic, and may involve a "pill-rolling" motion of the fingers [1]. *Postural instability* - **Postural instability** tends to be a later symptom, emerging as the disease progresses and affecting balance and gait [2]. - It is not usually the **presenting complaint** in the early stages of Parkinson's disease [2]. *Rigidity* - **Rigidity**, characterized by increased muscle tone and resistance to passive movement, often develops after tremors or bradykinesia [1]. - It can manifest as **cogwheel** or **lead-pipe rigidity** and contributes to the stooped posture and reduced arm swing observed in Parkinson's patients [1]. *Bradykinesia* - **Bradykinesia** (slowness of movement) is a core motor symptom, often described as difficulty initiating or continuing movements [1]. - While present early, **tremors** are often the first symptom noticed by the patient or their family, making bradykinesia a close second in sequence [1].

Q: Which of the following is the most common initial presenting feature of multiple sclerosis:

Optic Neuritis. ***Optic Neuritis*** - **Optic neuritis** is a very common initial symptom of multiple sclerosis, occurring in 20-25% of patients. - It presents with **unilateral vision loss** (often painful), blurred vision, and a central scotoma, reflecting inflammation and demyelination of the optic nerve [1]. *Cerebellar Ataxia* - While **cerebellar ataxia** (impaired coordination, balance, speech) can occur in MS, it is less common as an initial presenting symptom. - It often develops later in the disease course due to demyelination in the **cerebellum** or its connections [1]. *Internuclear ophthalmoplegia* - **Internuclear ophthalmoplegia (INO)** is a specific eye movement disorder common in MS but rarely the very first symptom [1]. - It results from a lesion in the **medial longitudinal fasciculus (MLF)**, causing impaired adduction of one eye during conjugate gaze with nystagmus in the abducting eye. *Diplopia* - **Diplopia** (double vision) can be an early symptom of MS, but it is less frequent as the very first presentation compared to optic neuritis [1]. - It typically arises from lesions affecting the **cranial nerves** controlling eye movements (III, IV, VI) or their brainstem nuclei.

Q: Which of the following metal ions is associated with secondary Parkinsonisms?

Manganese (Mn). ***Manganese (Mn)*** - Chronic exposure to high levels of **manganese** can lead to **manganism**, a neurological disorder characterized by **Parkinsonian-like symptoms**, including bradykinesia, rigidity, and gait disturbances [1]. - This is due to manganese accumulation in the **basal ganglia**, particularly the **globus pallidus**, affecting dopaminergic pathways. *Magnesium (Mg)* - **Magnesium** is an essential mineral vital for numerous bodily functions, including nerve and muscle function. - While imbalances can cause neurological issues (e.g., tremors with hypomagnesemia), it is not directly associated with **secondary parkinsonism**. *Selenium (Se)* - **Selenium** is a trace element with antioxidant properties, important for thyroid hormone metabolism and immune function. - Both deficiency and toxicity can cause various health problems, but it is not known to cause **secondary parkinsonism**. *Molybdenum (Mo)* - **Molybdenum** is an essential trace element that functions as a cofactor for several enzymes. - No known association exists between molybdenum exposure, deficiency, or toxicity and the development of **secondary parkinsonism**.

Q: Which of the following sites is responsible for the amnestic defect in Wernicke's Korsakoff syndrome:

Thalamus. ***Thalamus*** - Damage to the **medial dorsal nucleus of the thalamus** is a key pathological finding in Wernicke's Korsakoff syndrome, directly contributing to the severe **anterograde and retrograde amnesia** [1]. - The thalamus plays a crucial role in memory consolidation and retrieval, acting as a relay station for information processing between cortical and subcortical structures. *Mammillary body* - While **mammillary body damage** is characteristic of Wernicke-Korsakoff syndrome, it is primarily associated with the **acute Wernicke encephalopathy phase** and contributes to the overall amnesia through its connections with the thalamus and hippocampus, rather than being the sole site for the amnestic defect [1]. - The mammillary bodies are part of the **Papez circuit**, which is important for episodic memory, but their lesion alone doesn't fully explain the complete amnestic syndrome. *Hippocampus* - The **hippocampus** is critical for the formation of new memories, and its damage typically causes **anterograde amnesia**, as seen in conditions like temporal lobe epilepsy or anoxia. - While memory is affected, direct **hippocampal lesions are not the primary pathology** in Wernicke-Korsakoff syndrome; the memory impairment arises from damage to structures *connected* to the hippocampus, such as the thalamus and mammillary bodies. *Periventricular Grey matter* - The **periventricular grey matter** is involved in various autonomic functions and pain modulation, not directly in memory formation or retrieval. - While lesions in this area can occur in Wernicke-Korsakoff syndrome, they are not considered the primary cause of the **amnestic defect**.

Q: Inability to recognize faces is known as:

Inability to recognize faces. ***Prosopagnosia (Inability to recognize faces)*** - The inability to recognize faces is medically termed **prosopagnosia**, a neurological disorder. - It often results from damage to the **fusiform gyrus** in the temporal lobe, a region critical for facial recognition. - Patients can see faces clearly but cannot identify familiar individuals, including family members. *Alexia (Inability to read)* - This symptom describes **alexia** or **dyslexia**, which are disorders characterized by difficulty with reading, not face recognition. - Alexia can result from brain injury, while dyslexia is a developmental learning disorder. *Agraphia (Inability to write)* - This condition is known as **agraphia** or **dysgraphia**, referring to impaired writing ability. - Agraphia can occur after brain injury, whereas dysgraphia is often a developmental condition. *Aphasia (Inability to speak)* - Difficulty or inability to speak is called **aphasia** or **dysarthria**, depending on the underlying cause. - **Aphasia** involves language processing issues, while **dysarthria** relates to motor control of speech.

Q: In which condition is the Doll's Eye Reflex tested?

Unconscious patients. ***Unconscious patients*** - The **Doll's Eye Reflex**, also known as the **oculocephalic reflex**, is a brainstem reflex used to assess brainstem function in **comatose or unconscious patients** [1]. - It is positive if the eyes move in the opposite direction to the head turn, indicating intact brainstem pathways [1]. *Hemiplegic* - **Hemiplegia** refers to paralysis on one side of the body, often due to stroke or brain injury. - While it can be associated with altered consciousness, the Doll's Eye Reflex specifically tests brainstem integrity in unconscious states, not the motor deficits of hemiplegia itself. *Paraplegic* - **Paraplegia** is paralysis affecting the lower half of the body. - This condition primarily involves spinal cord damage and does not directly relate to the assessment of brainstem function using the Doll's Eye Reflex. *Cerebral palsy* - **Cerebral palsy** is a group of disorders affecting movement, muscle tone, or posture, caused by damage to the developing brain. - While individuals with cerebral palsy may have neurological impairments, the Doll's Eye Reflex is not a primary diagnostic or assessment tool for this chronic condition; it is used acutely in unconscious states.

Question 1

What is Prosopagnosia?

Accepted Answer

Difficulty in identifying known faces

Answer

Impairment of consciousness

Answer

Being unaware of one's problems

Answer

Failure to identify objects

Question 2

Thrombosis of posterior inferior cerebellar artery causes:

Accepted Answer

Lateral Medullary Syndrome (Wallenberg's syndrome)

Answer

Weber's syndrome

Answer

No effect

Answer

Medial Medullary Syndrome

Question 3

Which of the following statements about Weber’s syndrome is incorrect?

Accepted Answer

Weber's syndrome involves the anterior cerebral artery.

Answer

Ipsilateral Oculomotor nerve palsy is a feature of Weber's syndrome.

Answer

Contralateral Parkinsonism is a feature of Weber's syndrome.

Answer

Contralateral hemiplegia is a feature of Weber's syndrome.

Question 4

What is the earliest feature of 3rd cranial nerve involvement in a patient with diabetes mellitus?

Accepted Answer

Ptosis or diplopia

Answer

Abnormal light reflex

Answer

Normal light reflex

Answer

Eye pain

Question 5

What is the first symptom of Parkinson's disease?

Accepted Answer

Tremors

Answer

Rigidity

Answer

Postural instability

Answer

Bradykinesia

Question 6

Which of the following is the most common initial presenting feature of multiple sclerosis:

Accepted Answer

Optic Neuritis

Answer

Cerebellar Ataxia

Answer

Internuclear ophthalmoplegia

Answer

Diplopia

Question 7

Which of the following metal ions is associated with secondary Parkinsonisms?

Accepted Answer

Manganese (Mn)

Answer

Magnesium (Mg)

Answer

Selenium (Se)

Answer

Molybdenum (Mo)

Question 8

Which of the following sites is responsible for the amnestic defect in Wernicke's Korsakoff syndrome:

Accepted Answer

Thalamus

Answer

Hippocampus

Answer

Mammillary body

Answer

Periventricular Grey matter

Question 9

Inability to recognize faces is known as:

Accepted Answer

Inability to recognize faces

Answer

Inability to read

Answer

Inability to write

Answer

Inability to speak

Question 10

In which condition is the Doll's Eye Reflex tested?

Accepted Answer

Unconscious patients

Answer

Hemiplegic

Answer

Paraplegic

Answer

Cerebral palsy

Neurology — MCQs

Neurology — MCQs

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