Neurology — MCQs

A 6.5-month-old infant presented with altered behavior, cyanosis, weak cry, drooling, diminished feeding, and constipation for 1 week. On examination, shallow respiration, generalized flaccidity, absent deep tendon reflexes, and drooping eyelids were noted. There was no history of fever, cough, or coryza. The prenatal and antenatal periods were uncomplicated, and developmental milestones were progressing normally. The child was recently started on pureed foods along with small amounts of honey. Laboratory and CSF studies were normal. SERS-based immunoassay revealed a positive test. The motility of the implicated organism is due to which type of flagella?

Neurology Indian Medical PG Practice Questions and MCQs

Question 51: Which of the following is the most common intracranial tumor in children?

A. Glioma (Correct Answer)
B. Meningioma
C. Medulloblastoma
D. Lymphangioma

Explanation: **Explanation:** In the pediatric population, central nervous system (CNS) tumors are the most common solid tumors. When categorizing these by histological type, **Gliomas** are the most common intracranial tumors in children. **1. Why Glioma is Correct:** The term "Glioma" is an umbrella category that includes various subtypes such as Astrocytomas, Ependymomas, and Oligodendrogliomas. Among these, **Astrocytomas** (specifically Juvenile Pilocytic Astrocytoma) are the most frequent. Collectively, gliomas account for approximately 50-60% of all pediatric brain tumors. **2. Why the other options are incorrect:** * **Medulloblastoma:** While this is the most common **malignant** (embryonal) brain tumor in children and the most common tumor of the posterior fossa, it is less frequent than the total group of gliomas. * **Meningioma:** These are common in adults but are extremely rare in children. Their presence in a pediatric patient should raise suspicion for Neurofibromatosis Type 2 (NF2). * **Lymphangioma:** This is a benign malformation of the lymphatic system, typically occurring in the neck (cystic hygroma) or axilla, and is not an intracranial tumor. **High-Yield Clinical Pearls for NEET-PG:** * **Most common solid tumor in children:** CNS Tumors. * **Most common benign CNS tumor:** Pilocytic Astrocytoma (Grade I). * **Most common malignant CNS tumor:** Medulloblastoma. * **Infratentorial vs. Supratentorial:** In children (aged 1–10 years), the majority of tumors are **infratentorial** (posterior fossa). In infants (<1 year) and adults, they are primarily supratentorial. * **Classic Triad:** Morning headache, vomiting, and papilledema (signs of increased ICP).

Question 52: An infant of 5 months presents with sudden dropping of head and flexion of arms. On examination, the infant has a hypopigmented macule on the trunk. What is the drug of choice for this condition?

A. Vigabatrin (Correct Answer)
B. Sodium Valproate
C. Ethosuximide
D. ACTH

Explanation: ### Explanation **Diagnosis: West Syndrome (Infantile Spasms) secondary to Tuberous Sclerosis Complex (TSC).** The clinical triad of **infantile spasms** (sudden head dropping and arm flexion), **hypsarrhythmia** on EEG (though not mentioned, it is characteristic), and **mental retardation** defines West Syndrome. The presence of a **hypopigmented macule** (Ash-leaf spot) is a pathognomonic sign of Tuberous Sclerosis, which is the most common identifiable cause of West Syndrome. **1. Why Vigabatrin is the Correct Answer:** While ACTH is generally the first-line treatment for idiopathic West Syndrome, **Vigabatrin** is the specific **drug of choice** when the condition is associated with **Tuberous Sclerosis**. It acts by irreversibly inhibiting GABA transaminase, increasing GABA levels in the brain. It has shown superior efficacy in controlling spasms specifically in TSC patients. **2. Why Other Options are Incorrect:** * **ACTH:** This is the drug of choice for West Syndrome *not* associated with Tuberous Sclerosis. In this specific clinical vignette, the Ash-leaf spot makes Vigabatrin the preferred answer. * **Sodium Valproate:** Used as a second-line or adjunctive therapy if first-line agents fail, but it is not the primary choice for infantile spasms. * **Ethosuximide:** This is the drug of choice for **Absence Seizures**, not infantile spasms. **Clinical Pearls for NEET-PG:** * **Classic EEG finding:** Hypsarrhythmia (disorganized, high-amplitude waves and spikes). * **Vigabatrin Side Effect:** Permanent **visual field constriction** (requires periodic ophthalmological screening). * **Tuberous Sclerosis Triad (Vogt’s Triad):** Adenoma sebaceum, mental retardation, and epilepsy. * **Prognosis:** Generally poor; early treatment is crucial to prevent further cognitive decline.

Question 53: A 18-month-old baby presents with recurrent episodes of excessive crying followed by cyanosis, unconsciousness, and occasional seizures since 9 months of age. What is the most likely diagnosis?

A. Epilepsy
B. Anoxic spells
C. Breath holding spells (Correct Answer)
D. Vasovagal attack

Explanation: **Explanation:** The clinical presentation of a toddler with episodes triggered by **excessive crying** or frustration, followed by **cyanosis** and brief **unconsciousness**, is classic for **Breath Holding Spells (BHS)**. These are non-epileptic paroxysmal events occurring in children typically aged 6 months to 2 years. The sequence is: Provocation (anger/pain) → Vigorous crying → Expiration → Apnea → Cyanosis → Loss of consciousness. If the apnea is prolonged, generalized hypertonia or brief clonic jerks (reflex anoxic seizures) may occur, which are often confused with epilepsy. **Analysis of Options:** * **Epilepsy (A):** Seizures are usually unprovoked and not preceded by crying. In BHS, the loss of consciousness occurs *after* the crying and apnea, whereas in epilepsy, it is the primary event. * **Anoxic Spells (B):** Also known as "Tet spells," these are seen in Cyanotic Heart Disease (e.g., TOF). While they involve cyanosis, they are usually triggered by feeding or waking up and are associated with a systolic murmur and "squatting" in older children. * **Vasovagal Attack (D):** These are rare in infants and more common in adolescents. They are usually triggered by standing for long periods or medical procedures and present with pallor and diaphoresis rather than cyanotic crying fits. **High-Yield Pearls for NEET-PG:** 1. **Types:** Two types exist—**Cyanotic** (most common, triggered by anger) and **Pallid** (triggered by sudden pain/fright, mediated by the vagus nerve). 2. **Association:** BHS is strongly associated with **Iron Deficiency Anemia**. Treating the anemia often reduces the frequency of spells. 3. **Prognosis:** Excellent; most children outgrow these spells by age 5. 4. **Management:** Reassurance to parents is the mainstay. No anticonvulsants are required.

Question 54: All of the following are complications of Duchenne Muscular dystrophy except?

A. Cardiomyopathy
B. Contractures
C. Malignant hyperthermia after anesthesia (Correct Answer)
D. Respiratory failure

Explanation: **Explanation:** Duchenne Muscular Dystrophy (DMD) is an X-linked recessive disorder caused by a mutation in the **dystrophin gene**, leading to progressive muscle degeneration. **Why Option C is the correct answer:** While DMD patients are at high risk for **Anesthesia-Induced Rhabdomyolysis (AIR)** when exposed to volatile anesthetics (like halothane) or succinylcholine, they do **not** develop true **Malignant Hyperthermia (MH)**. MH is specifically caused by a mutation in the *RYR1* (ryanodine receptor) or *CACNA1S* genes. Although the clinical presentation of AIR (hyperkalemia, rhabdomyolysis) mimics MH, the underlying pathophysiology is different; therefore, MH is not considered a direct complication of DMD. **Analysis of Incorrect Options:** * **A. Cardiomyopathy:** Dystrophin is also absent in cardiac muscle. Dilated cardiomyopathy and arrhythmias are nearly universal in DMD patients by the second decade of life. * **B. Contractures:** Progressive muscle fibrosis and weakness lead to joint immobility. Equinovarus (clubfoot) deformities and knee/hip contractures are classic features. * **D. Respiratory Failure:** Weakness of the diaphragm and intercostal muscles, combined with scoliosis, leads to restrictive lung disease. This is the most common cause of death in DMD. **High-Yield Clinical Pearls for NEET-PG:** * **Gower’s Sign:** Use of hands to "climb up" the legs to stand due to proximal muscle weakness. * **Pseudohypertrophy:** The calves appear large but are actually composed of fat and connective tissue (fibrosis). * **Diagnosis:** Elevated Serum Creatine Kinase (CK) is the initial screening test (often >10-50x normal); Genetic testing for dystrophin gene deletion is the gold standard. * **Management:** Glucocorticoids (Prednisolone) are the mainstay to improve strength and delay progression.

Question 55: If an otherwise well child presents with a first episode of unprovoked seizures and continues to have seizures despite two doses of Lorazepam, what drug should be administered next?

A. Phenobarbitone
B. Phenytoin (Correct Answer)
C. Valproate
D. Levetiracetam

Explanation: This question addresses the management of **Status Epilepticus (SE)** in the pediatric population. The management follows a structured, time-dependent algorithm. ### **Why Phenytoin is Correct** The standard protocol for status epilepticus is divided into stages: 1. **Stage 1 (Early SE / 0–10 mins):** Benzodiazepines are the first-line treatment. **Lorazepam** (0.1 mg/kg) is preferred due to its rapid onset and longer duration of action in the brain compared to Diazepam. 2. **Stage 2 (Established SE / 10–30 mins):** If seizures persist after two doses of benzodiazepines, the next step is a long-acting anti-epileptic drug (AED). **Phenytoin (or Fosphenytoin)** is the traditional gold-standard second-line agent. It is administered as a loading dose (20 mg/kg) to achieve rapid therapeutic levels and prevent seizure recurrence. ### **Why Other Options are Incorrect** * **A. Phenobarbitone:** This is the drug of choice for **neonatal seizures**. In older children, it is typically reserved as a third-line agent if Phenytoin fails, as it can cause significant respiratory depression and sedation. * **C. Valproate:** While effective, it is generally avoided as a first-line emergency agent in young children due to the risk of hepatotoxicity (especially if a metabolic disorder is suspected) and is often considered after Phenytoin. * **D. Levetiracetam:** Although increasingly used in clinical practice due to its safety profile, Phenytoin remains the classic textbook answer for NEET-PG based on standard IAP (Indian Academy of Pediatrics) and APLS guidelines. ### **High-Yield Clinical Pearls** * **Maximum rate of Phenytoin infusion:** 1 mg/kg/min (not to exceed 50 mg/min) to avoid cardiac arrhythmias and hypotension. * **Fosphenytoin** is preferred over Phenytoin where available because it can be infused faster and causes less local tissue irritation (Purple Glove Syndrome). * **Definition Change:** While the traditional definition of SE is >30 minutes, the operational definition for starting treatment is any seizure lasting **>5 minutes**.

Question 56: A 4-year-old child presents with developmental delay and episodes of multiple seizure types. The child did not respond despite multiple drug therapies. EEG showed a 1-2 Hz spike and wave pattern. What is the diagnosis?

A. Lennox-Gastaut syndrome (Correct Answer)
B. Rolandic seizures
C. Juvenile myoclonic epilepsy
D. Jang syndrome

Explanation: **Explanation:** The clinical presentation and EEG findings are classic for **Lennox-Gastaut Syndrome (LGS)**, a severe childhood-onset epileptic encephalopathy. **1. Why Option A is correct:** LGS is defined by a characteristic "triad": * **Multiple seizure types:** Most commonly tonic seizures (especially during sleep), atonic (drop attacks), and atypical absence seizures. * **Cognitive impairment:** Developmental delay or regression is a hallmark. * **EEG pattern:** Shows a characteristic **slow spike-and-wave pattern (1–2.5 Hz)**. The case describes drug resistance, which is typical as LGS is notoriously difficult to treat. **2. Why the other options are incorrect:** * **Option B (Rolandic Seizures):** Also known as Benign Epilepsy with Centrotemporal Spikes (BECTS). It occurs in neurologically normal children, features nocturnal focal seizures, and shows centrotemporal spikes on EEG. It has an excellent prognosis. * **Option C (Juvenile Myoclonic Epilepsy):** Typically presents in adolescents (not 4-year-olds) with myoclonic jerks upon awakening. The EEG shows a faster **4–6 Hz polyspike-and-wave** pattern. * **Option D (Jang Syndrome):** This is not a recognized clinical entity in standard pediatric neurology; it may be a distractor. **High-Yield Clinical Pearls for NEET-PG:** * **Age of onset:** Usually 1 to 8 years. * **Evolution:** Many cases of LGS evolve from **West Syndrome** (Infantile spasms). * **EEG Hallmark:** Slow spike-wave (<3 Hz) is the "buzzword" for LGS. * **Management:** Valproate is first-line; Rufinamide, Lamotrigine, and Topiramate are used as adjuncts. Ketogenic diet or Vagus Nerve Stimulation (VNS) are considered for refractory cases.

Question 57: The "Setting Sun" sign is seen in which of the following conditions?

A. Hydrocephalus (Correct Answer)
B. Meningitis
C. Brain abscess
D. CNS tumor

Explanation: **Explanation:** The **"Setting Sun" sign** (or sunset eye phenomenon) is a classic clinical sign characterized by the downward deviation of the eyes, where the iris appears to be sinking below the lower eyelid, leaving the white sclera visible above. **Why Hydrocephalus is correct:** In infants, hydrocephalus leads to increased intracranial pressure (ICP) and expansion of the third ventricle. This causes pressure on the **midbrain tectum (specifically the superior colliculi)** and the periaqueductal area. This compression results in **Parinaud’s syndrome** (upward gaze palsy), forcing the eyes downward. Because infant cranial sutures are not yet fused, the expanding head further accentuates this appearance. **Why other options are incorrect:** * **Meningitis:** While it can cause increased ICP, it typically presents with signs of meningeal irritation (Kernig’s/Brudzinski’s signs), fever, and a bulging fontanelle rather than specific gaze palsies. * **Brain Abscess:** This is a focal space-occupying lesion. While it may cause midline shifts or localized deficits, it does not classically present with the symmetrical setting sun sign unless it leads to secondary obstructive hydrocephalus. * **CNS Tumor:** Certain tumors (like Pinealomas) can cause Parinaud’s syndrome, but the "Setting Sun" sign is specifically the hallmark clinical descriptor for **infantile hydrocephalus**. **High-Yield Clinical Pearls for NEET-PG:** * **Macewen’s Sign (Cracked-pot sound):** Percussion of the skull in hydrocephalus yields a resonant sound due to separated sutures. * **Transillumination Test:** Positive in cases of severe hydrocephalus or hydranencephaly. * **Treatment of Choice:** Ventriculoperitoneal (VP) shunt. * **Note:** The setting sun sign can occasionally be seen transiently in normal neonates, but persistent presence always indicates pathology.

Question 58: Lennox Gastaut syndrome is characterized by?

A. Single seizure type
B. Occurs in adults
C. Good prognosis with adequate control
D. EEG showing less than 2.5 Hz spike and wave discharge (Correct Answer)

Explanation: **Lennox-Gastaut Syndrome (LGS)** is a severe childhood-onset epilepsy syndrome characterized by a classic clinical triad. Understanding this triad is essential for NEET-PG. ### **Why Option D is Correct** The hallmark EEG finding in LGS is a **slow spike-and-wave pattern** occurring at a frequency of **<2.5 Hz** (typically 1.5–2.5 Hz). This pattern is usually generalized and occurs during wakefulness. During sleep, patients often exhibit **paroxysmal fast activity (GPFA)**. These EEG findings are pathognomonic and differentiate LGS from other childhood epilepsies like Absence Seizures (which show 3 Hz spikes). ### **Analysis of Incorrect Options** * **Option A (Single seizure type):** LGS is defined by **multiple seizure types**. The most common are tonic seizures (especially during sleep), atypical absence, and atonic seizures (leading to "drop attacks"). * **Option B (Occurs in adults):** LGS is a pediatric epilepsy syndrome. The peak age of onset is between **3 to 5 years**. While patients carry the condition into adulthood, it does not *originate* in adults. * **Option C (Good prognosis):** LGS has a **poor prognosis**. It is highly refractory to standard anti-epileptic drugs and is almost always associated with progressive cognitive impairment and behavioral problems. ### **NEET-PG High-Yield Pearls** * **The LGS Triad:** 1. Multiple seizure types (Tonic, Atypical Absence, Atonic). 2. Cognitive impairment/Developmental delay. 3. EEG: Slow spike-and-wave (<2.5 Hz). * **Evolution:** LGS often evolves from **West Syndrome** (Infantile Spasms). * **Treatment:** Often requires polytherapy. **Valproate** is first-line; **Rufinamide, Lamotrigine, and Topiramate** are common adjuncts. Ketogenic diet or Corpus Callosotomy (for drop attacks) may be considered.

Question 59: In a child with infantile spasms and visual defects, which highly effective drug is generally avoided?

A. Lamotrigine
B. Topiramate
C. ACTH
D. Vigabatrin (Correct Answer)

Explanation: **Explanation:** **Vigabatrin** is a structural analog of GABA that irreversibly inhibits GABA-transaminase. While it is highly effective for infantile spasms (West Syndrome)—and is the first-line treatment for cases associated with Tuberous Sclerosis—it is notorious for causing **permanent peripheral visual field constriction** (retinal toxicity) in up to 30-50% of patients. In a child who already has pre-existing visual defects, adding a drug with a high risk of permanent visual loss is contraindicated or generally avoided to prevent further morbidity. **Analysis of Incorrect Options:** * **A. Lamotrigine:** This is an anticonvulsant used for various seizure types (like Lennox-Gastaut syndrome) but is not a primary treatment for infantile spasms and does not carry a specific risk of permanent visual field loss. * **B. Topiramate:** While it can cause ocular side effects like acute myopia or secondary angle-closure glaucoma, it is not the "highly effective" drug typically associated with the specific management dilemma of infantile spasms and chronic visual field defects. * **C. ACTH:** Adrenocorticotropic hormone is the overall first-line treatment for idiopathic infantile spasms. It has significant systemic side effects (hypertension, immunosuppression, Cushingoid features) but does not cause visual field defects. **Clinical Pearls for NEET-PG:** * **West Syndrome Triad:** Infantile spasms, Hypsarrhythmia on EEG, and Mental retardation. * **Drug of Choice (DOC):** ACTH is the DOC for most cases; **Vigabatrin** is the DOC specifically if **Tuberous Sclerosis** is the underlying cause. * **Monitoring:** Patients on Vigabatrin require baseline and periodic ophthalmologic screening (e.g., perimetry or electroretinogram).

Question 60: A 6.5-month-old infant presented with altered behavior, cyanosis, weak cry, drooling, diminished feeding, and constipation for 1 week. On examination, shallow respiration, generalized flaccidity, absent deep tendon reflexes, and drooping eyelids were noted. There was no history of fever, cough, or coryza. The prenatal and antenatal periods were uncomplicated, and developmental milestones were progressing normally. The child was recently started on pureed foods along with small amounts of honey. Laboratory and CSF studies were normal. SERS-based immunoassay revealed a positive test. The motility of the implicated organism is due to which type of flagella?

A. Peritrichial
B. Monotrichous
C. Lophotrichous (Correct Answer)
D. Amphitrichous

Explanation: ### **Explanation** The clinical presentation of a 6.5-month-old infant with **constipation** (often the first sign), **generalized flaccidity** ("floppy baby"), **ptosis** (drooping eyelids), and **weak cry** following the ingestion of **honey** is classic for **Infant Botulism**. The normal CSF studies help rule out Guillain-Barré Syndrome (Miller Fisher variant), and the absence of fever excludes most infectious encephalopathies. The diagnosis is confirmed by detecting *Clostridium botulinum* spores or toxins in the stool. *Clostridium botulinum* is a Gram-positive, anaerobic, spore-forming rod. While most *Clostridium* species (like *C. tetani*) possess **peritrichous** flagella, **subtypes of *Clostridium botulinum* (specifically Group I and II)** are characterized by **lophotrichous flagella** (multiple flagella at one pole) for their motility. #### **Analysis of Options:** * **Lophotrichous (Correct):** Multiple flagella at one or both ends. This is the characteristic motility structure for the organism implicated in this case (*C. botulinum*). * **Peritrichial (Incorrect):** Flagella distributed all over the cell surface. Common in *E. coli*, *Salmonella*, and *C. tetani*. * **Monotrichous (Incorrect):** A single flagellum at one pole (e.g., *Vibrio cholerae*, *Pseudomonas*). * **Amphitrichous (Incorrect):** Single flagella at both opposite poles (e.g., *Alcaligenes faecalis*). --- ### **Clinical Pearls for NEET-PG:** 1. **Infant Botulism Pathogenesis:** Ingestion of **spores** (from honey/soil) which germinate in the gut. In **Adult Botulism**, the pathology is due to ingestion of **pre-formed toxins** (canned foods). 2. **Mechanism:** The botulinum toxin cleaves **SNARE proteins**, preventing the release of **Acetylcholine** at the neuromuscular junction, leading to flaccid paralysis. 3. **Triad:** Afebrile, symmetric descending flaccid paralysis, and intact sensorium. 4. **Treatment:** Human-derived Botulism Immune Globulin (BIG-IV). Avoid antibiotics as they may increase toxin release via bacterial lysis.

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Headache Disorders

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Neuromuscular Disorders

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Neurodegenerative Disorders

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CNS Infections

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Hydrocephalus

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Movement Disorders

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Neurology — MCQs

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