Neurology Practice Questions

Q: A 72-year-old man complains of drooping of eyelids for the past 2 months. On awakening, he is able to open his eyes, but a few hours later his ptosis progressively worsens with increasing diplopia. What is the most likely diagnosis?

Myasthenia gravis. ### Explanation **Correct Answer: C. Myasthenia Gravis** The clinical hallmark of **Myasthenia Gravis (MG)** is **fatigability**. The patient’s symptoms (ptosis and diplopia) are absent or minimal in the morning (after rest) but worsen as the day progresses (with activity). This occurs due to autoimmune-mediated destruction of acetylcholine receptors at the neuromuscular junction, leading to failure of neuromuscular transmission upon repetitive stimulation. **Why the other options are incorrect:** * **A. Thyroid Ophthalmopathy:** Typically presents with **lid retraction** (Dalrymple sign) and proptosis, rather than ptosis. While it causes diplopia due to muscle infiltration, it does not show diurnal variation. * **B. Horner’s Syndrome:** Characterized by a triad of **mild ptosis** (due to Mueller’s muscle involvement), miosis, and anhidrosis. It is a sympathetic nerve palsy and does not feature diplopia or fatigability. * **D. 3rd Nerve Palsy:** Presents with **complete ptosis**, a "down and out" eye position, and often pupillary involvement. It is a static neurological deficit and does not fluctuate with rest or activity. **High-Yield Clinical Pearls for NEET-PG:** * **Cogan’s Lid Twitch:** A brief upward overshoot of the eyelid when the patient shifts gaze from downward to primary position; highly suggestive of MG. * **Ice Pack Test:** Placing ice over the eyelid for 2 minutes improves ptosis in MG (cold inhibits acetylcholinesterase). * **Simpson’s Test:** Worsening of ptosis on sustained upward gaze (demonstrates fatigability). * **Associated Conditions:** Always screen for **Thymoma** (Chest CT) in patients diagnosed with MG. * **Ocular Myasthenia:** In 50-60% of cases, MG starts with ocular symptoms; 90% of these will progress to systemic involvement within 2 years.

Q: Which medication is considered a treatment option for juvenile myoclonic epilepsy during pregnancy?

Levetiracetam. **Explanation:** **Juvenile Myoclonic Epilepsy (JME)** is a generalized epilepsy syndrome characterized by myoclonic jerks, generalized tonic-clonic seizures (GTCS), and absence seizures. While **Valproate** is the drug of choice for JME, it is highly **teratogenic** (associated with neural tube defects and cognitive impairment) and is generally avoided in women of childbearing age. **Why Levetiracetam is correct:** Levetiracetam is a broad-spectrum antiepileptic drug (AED) effective against myoclonic seizures. It is considered a preferred alternative in pregnancy because it has a **favorable safety profile** with a significantly lower risk of major congenital malformations compared to Valproate or Phenytoin. **Why the other options are incorrect:** * **Carbamazepine:** This is a narrow-spectrum AED. It is primarily used for focal seizures and can actually **exacerbate** myoclonic and absence seizures in JME patients. * **Vigabatrin:** It is primarily used for infantile spasms (West Syndrome) and refractory focal seizures. It is associated with permanent **visual field defects** and is not a standard treatment for JME. * **Phenytoin:** Like Carbamazepine, it can worsen myoclonic jerks. Furthermore, it is associated with **Fetal Hydantoin Syndrome** (cleft lip/palate, digital hypoplasia) when used during pregnancy. **NEET-PG High-Yield Pearls:** * **Drug of Choice for JME:** Valproate (in males/non-pregnant females). * **Safest AEDs in Pregnancy:** Levetiracetam and Lamotrigine. * **Lamotrigine caveat:** While safe in pregnancy, it may also worsen myoclonic seizures in some JME patients; hence, Levetiracetam is often preferred for this specific syndrome. * **Supplementation:** All pregnant women on AEDs should receive high-dose **Folic acid (5mg)** to reduce the risk of neural tube defects.

Q: Pseudocoma most commonly results from infarction or hemorrhage in which of the following structures?

Pons. **Explanation:** **Pseudocoma**, also known as **Locked-in Syndrome (LIS)**, is a clinical state where a patient is conscious and alert but suffers from total paralysis of all voluntary muscles except for vertical eye movements and blinking. 1. **Why Pons is Correct:** The most common cause of Locked-in Syndrome is a lesion (infarction due to basilar artery occlusion or hemorrhage) in the **ventral (anterior) portion of the Pons**. This lesion destroys the descending **corticospinal and corticobulbar tracts**, resulting in quadriplegia and paralysis of the lower cranial nerves. However, the **tegmentum of the pons** (containing the Reticular Activating System responsible for consciousness) and the **midbrain** (controlling vertical eye movements via the oculomotor nerve) are spared. 2. **Why Other Options are Incorrect:** * **Mid-brain:** Lesions here typically cause "Top of the Basilar" syndrome, often resulting in coma or third-nerve palsies, rather than the specific sparing of consciousness seen in LIS. * **Medulla:** Lesions in the medulla (e.g., Wallenberg syndrome) cause specific sensory and autonomic deficits but do not typically result in the global motor paralysis characteristic of pseudocoma. * **Hypothalamus:** Damage here usually leads to disturbances in autonomic function, temperature regulation, or sleep-wake cycles (Akinetic Mutism), not the de-efferented state of LIS. **Clinical Pearls for NEET-PG:** * **Classic Triad:** Quadriplegia, aphonia (inability to speak), and preserved consciousness. * **Preserved Function:** Vertical eye movement and blinking (controlled by the midbrain). * **EEG Findings:** Normal (reflecting preserved cortical activity/wakefulness). * **Differential Diagnosis:** Must be distinguished from **Akinetic Mutism** (lesion in the frontal lobes/hypothalamus where the patient *lacks the will* to move) and **Persistent Vegetative State** (where consciousness is lost).

Q: Which of the following is a true statement about medial medullary syndrome?

Ipsilateral 12th nerve palsy. **Explanation:** **Medial Medullary Syndrome (Dejerine Syndrome)** occurs due to the occlusion of the **Anterior Spinal Artery** or the paramedian branches of the vertebral artery. This results in an "alternating hemiplegia" pattern involving specific structures in the medial medulla. **Why Option C is correct:** The **Hypoglossal nerve (CN XII) nucleus and its exiting fibers** are located medially in the medulla. Damage to these fibers results in **ipsilateral LMN-type paralysis of the tongue**, causing the tongue to deviate toward the side of the lesion when protruded. **Analysis of Incorrect Options:** * **Option A (3rd nerve palsy):** This is a feature of **Weber’s Syndrome**, which involves the midbrain, not the medulla. * **Option B (6th nerve palsy):** This is seen in **Foville’s Syndrome** or **Millard-Gubler Syndrome**, which involve the pons. * **Option D (Ipsilateral hemiplegia):** The syndrome involves the **Medullary Pyramids**. Since the corticospinal fibers decussate *below* this level (at the cervicomedullary junction), damage here results in **contralateral hemiplegia**, not ipsilateral. **High-Yield Clinical Pearls for NEET-PG:** * **The Medial Medullary Triad:** 1. **Ipsilateral CN XII palsy** (Tongue deviation). 2. **Contralateral Hemiplegia** (Pyramidal tract involvement). [1] 3. **Contralateral loss of vibration/proprioception** (Medial Lemniscus involvement). * **Contrast with Lateral Medullary Syndrome (Wallenberg):** Wallenberg involves the PICA and presents with sensory loss, ataxia, and dysphagia, but **spares** the motor tracts and CN XII.

Q: A patient presents with an obnoxious smell and hallucinations. Which brain region lesion is most likely associated with these symptoms?

Temporal lobe lesion. **Explanation:** The clinical presentation of **olfactory hallucinations** (often described as an "obnoxious" or foul smell like burning rubber or garbage) is a classic localizing sign for **Temporal Lobe** pathology. **1. Why Temporal Lobe is Correct:** The primary olfactory cortex is located in the **uncus** and the piriform cortex, which are parts of the medial temporal lobe. Irritative lesions in this area, such as tumors or focal epilepsy (specifically **Uncinate Fits**), trigger these phantom smells. Additionally, the temporal lobe contains the hippocampus and amygdala, which are integral to the limbic system; lesions here frequently manifest as complex sensory hallucinations and emotional disturbances. **2. Why Other Options are Incorrect:** * **Frontal Lobe:** Lesions here typically present with executive dysfunction, personality changes (disinhibition or apathy), and primitive reflexes (e.g., snout, grasp). It does not primarily process sensory hallucinations. * **Parietal Lobe:** This region is responsible for somatosensory processing. Lesions lead to agnosia, apraxia, or disturbances in spatial orientation and body image (e.g., Gerstmann syndrome). * **Occipital Lobe:** This is the visual processing center. Lesions or seizures here result in **visual hallucinations** (often simple flashes or colors) or cortical blindness. **Clinical Pearls for NEET-PG:** * **Uncinate Fits:** Olfactory hallucinations preceding a seizure strongly suggest a temporal lobe origin. * **Schizophrenia vs. Organic:** While auditory hallucinations are common in Schizophrenia, **olfactory and gustatory hallucinations** should always prompt an investigation for organic causes (like temporal lobe epilepsy or tumors). * **Klüver-Bucy Syndrome:** Resulting from bilateral temporal lobe damage, it presents with hypersexuality, hyperphagia, and visual agnosia.

Q: Unilateral proptosis and bilateral 6th nerve palsy are seen in which condition?

Cavernous sinus thrombosis. **Explanation:** **Cavernous Sinus Thrombosis (CST)** is the correct answer due to the unique anatomical relationship between the cavernous sinus and the cranial nerves. 1. **Why it is correct:** The cavernous sinus contains the internal carotid artery and the **Abducens nerve (CN VI)** within the sinus itself (medial to the artery), while CN III, IV, and V1/V2 are in the lateral wall. Because the two cavernous sinuses communicate via the intercavernous plexuses, a septic thrombus (usually from the "danger area" of the face) rapidly spreads from one side to the other. This leads to **bilateral 6th nerve palsy** (the most common and earliest sign). **Proptosis** occurs due to impaired venous drainage from the ophthalmic veins, which may initially be unilateral before progressing. 2. **Why other options are incorrect:** * **Meningitis:** While it can cause multiple cranial nerve palsies due to basal exudates, it typically presents with systemic signs (fever, neck rigidity) and does not cause proptosis. * **Hydrocephalus:** Increased intracranial pressure in hydrocephalus can cause a "false localizing" 6th nerve palsy (often bilateral), but it does not cause proptosis. It is more commonly associated with papilledema and the "setting-sun" sign. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest sign of CST:** Paralysis of the Abducens nerve (CN VI). * **Most common cause:** *Staphylococcus aureus* infection from the face/nasal area. * **Triad of CST:** Fever, periorbital edema, and chemosis with ophthalmoplegia. * **Differentiating from Orbital Cellulitis:** CST presents with **rapidly bilateral** symptoms and involvement of the opposite eye, whereas orbital cellulitis remains localized for longer.

Question 1

A 72-year-old man complains of drooping of eyelids for the past 2 months. On awakening, he is able to open his eyes, but a few hours later his ptosis progressively worsens with increasing diplopia. What is the most likely diagnosis?

Accepted Answer

Myasthenia gravis

Answer

Thyroid ophthalmopathy

Answer

Horner's syndrome

Answer

3rd nerve Palsy

Question 2

Which medication is considered a treatment option for juvenile myoclonic epilepsy during pregnancy?

Accepted Answer

Levetiracetam

Answer

Carbamazepine

Answer

Vigabatrin

Answer

Phenytoin

Question 3

A 70-year-old hypertensive male presents complaining of a brief episode of slurred speech and left-sided weakness the previous evening. He gives a history of two transient episodes of sudden loss of vision in his right eye last month. His neurological examination is normal now. What is the most appropriate next diagnostic test?

Accepted Answer

Carotid Doppler

Answer

CT Scan

Answer

Diffusion-weighted MRI

Answer

Cerebral Angiography

Question 4

Pseudocoma most commonly results from infarction or hemorrhage in which of the following structures?

Accepted Answer

Pons

Answer

Mid-brain

Answer

Medulla

Answer

Hypothalamus

Question 5

A 15-year-old boy experiences 10-12 complex partial seizures daily despite being on adequate four-drug antiepileptic therapy. He has a history of recurrent high-grade fevers in childhood. An MRI performed with an epilepsy protocol shows a normal brain scan. What is the best non-invasive strategy to establish a definitive diagnosis for epilepsy surgery preparation?

Accepted Answer

Video EEG with ictal 99mTc-HMPAO Brain SPECT

Answer

Interictal scalp EEG

Answer

Video EEG

Answer

Interictal 18F-FDG PET

Question 6

Which of the following is a true statement about medial medullary syndrome?

Accepted Answer

Ipsilateral 12th nerve palsy

Answer

3rd nerve palsy

Answer

6th nerve palsy

Answer

Ipsilateral hemiplegia

Question 7

Opsoclonus-myoclonus syndrome is encountered as a clinical feature of which of the following conditions?

Accepted Answer

Cerebral atrophy

Answer

Meningioma

Answer

Excision

Answer

Neurofibromatosis

Question 8

A patient presents with an obnoxious smell and hallucinations. Which brain region lesion is most likely associated with these symptoms?

Accepted Answer

Temporal lobe lesion

Answer

Frontal lobe lesion

Answer

Parietal lobe lesion

Answer

Occipital lobe lesion

Question 9

All of the following are present on the ipsilateral side in Lateral medullary syndrome except?

Accepted Answer

Impaired pain sensation in the body

Answer

Diplopia

Answer

Horner syndrome

Answer

Facial pain

Question 10

Unilateral proptosis and bilateral 6th nerve palsy are seen in which condition?

Accepted Answer

Cavernous sinus thrombosis

Answer

Meningitis

Answer

Hydrocephalus

Answer

None of the above

Neurology — MCQs

Neurology — MCQs

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