Developmental Delay and Intellectual Disability — MCQs
What is the maximum age limit for children covered under the Integrated Child Development Services (ICDS) scheme?
Severe mental retardation is:
A 14-year-old boy has difficulty in expressing himself in writing and makes frequent spelling mistakes. He passes his examination with poor marks. However, his mathematical ability and social adjustment are appropriate for his age. Which of the following is the most likely diagnosis?
A child with pervasive developmental disorder will have all of the following except:
Subtelomeric rearrangement of genes is frequently associated with intellectual disability. All of the following techniques can be used to diagnose them except:
A 5-year-old child is assessed to have a developmental age of one year. What is his developmental quotient?
A neonate presents with the clinical features shown in the image below. What is the most likely diagnosis?
The given karyotype is seen in which of the following syndromes?
The diagrammatic representation of the karyotype of an individual indicates a specific genetic abnormality. What is the diagnosis?
In a child with IQ 50, which of the following is true:
Developmental Delay and Intellectual Disability Indian Medical PG Practice Questions and MCQs
Question 1: What is the maximum age limit for children covered under the Integrated Child Development Services (ICDS) scheme?
- A. 6 years (Correct Answer)
- B. 10 years
- C. 4 years
- D. 8 years
Explanation: ***6 years*** - The **Integrated Child Development Services (ICDS) scheme** is primarily designed to address the nutritional, health, and developmental needs of children under the age of 6. - This age limit ensures that critical early childhood development—from infancy through preschool—is supported with interventions like **supplementary nutrition**, **immunization**, health check-ups, and pre-school education. *10 years* - This age range would extend coverage beyond the **critical early childhood development period** that ICDS focuses on. - Programs for children aged 6 to 10 years typically fall under primary education or other health initiatives, not the targeted ICDS framework. *4 years* - This is **insufficient** as ICDS is specifically designed to cover the entire **0-6 years age group**, ensuring comprehensive early childhood development support. - Limiting coverage to 4 years would exclude preschool-aged children (4-6 years) from crucial developmental interventions during a critical growth period. *8 years* - An 8-year age limit would also exceed the primary target group for ICDS, which emphasizes **early childhood intervention** up to 6 years. - Children aged 6 to 8 are usually enrolled in primary school, and their specific needs are often addressed through educational and school-based health programs.
Question 2: Severe mental retardation is:
- A. <20
- B. 35-50
- C. 20-35 (Correct Answer)
- D. 50-70
Explanation: ***20-35*** - A **score between 20-35** indicates **severe mental retardation**, where individuals typically have very limited communication skills and require extensive support in daily living activities. - This range is associated with significant cognitive impairment that often necessitates full-time supervision. *<20* - An **IQ score below 20** signifies **profound mental retardation**, indicating extremely limited intellectual functioning and severe developmental delays. - Individuals in this category generally have very minimal capacity for self-care or communication. *35-50* - This IQ range reflects **moderate mental retardation**, where individuals can often develop some basic communication and self-care skills, but still require significant support. - They may live semi-independently with supervision, but struggle with academic and complex social tasks. *50-70* - An **IQ score between 50-70** is classified as **mild mental retardation**, which is the most common form. - Individuals often achieve academic skills up to a 6th-grade level and can live independently with appropriate support.
Question 3: A 14-year-old boy has difficulty in expressing himself in writing and makes frequent spelling mistakes. He passes his examination with poor marks. However, his mathematical ability and social adjustment are appropriate for his age. Which of the following is the most likely diagnosis?
- A. Specific learning disability (Correct Answer)
- B. Intellectual disability
- C. Examination anxiety
- D. Lack of interest in studies
Explanation: ***Specific learning disability*** - The boy's difficulties specifically in **writing** and **spelling** despite age-appropriate mathematical ability and social adjustment are characteristic of a **specific learning disorder**. - These disorders affect specific academic skills like **dysgraphia** (writing) or **dysorthographia** (spelling) while other cognitive functions remain intact. *Intellectual disability* - This condition involves significant limitations in **both intellectual functioning** (e.g., reasoning, problem-solving) and **adaptive behavior** (e.g., conceptual, social, practical skills). - The boy's appropriate **mathematical ability** and **social adjustment** argue against a diagnosis of intellectual disability. *Examination anxiety* - While examination anxiety can lead to poor test performance, it typically affects performance across various subjects due to **stress** and **panic**, rather than specific difficulties in writing or spelling. - It would not explain a fundamental difficulty in **expressing himself in writing** regardless of the context. *Lack of interest in studies* - Lack of interest might lead to poor academic performance, but it doesn't typically manifest as specific difficulties with **writing and spelling mechanics** while other cognitive abilities are preserved. - A student lacking interest might simply not try, but usually wouldn't have a fundamental inability to perform the task if motivated.
Question 4: A child with pervasive developmental disorder will have all of the following except:
- A. Stereotyped behaviour
- B. Reduced social interaction
- C. Poor language skills
- D. Impaired cognition (Correct Answer)
Explanation: ***Impaired cognition*** - While some individuals with **pervasive developmental disorders (PDDs)** may have comorbid intellectual disability, **impaired cognition is not a universal or defining characteristic** of PDDs. - Many individuals with PDDs, particularly those with **Asperger's syndrome**, have **average or above-average intelligence**. - Intelligence quotient (IQ) varies widely across the autism spectrum, making cognitive impairment a non-essential feature. *Stereotyped behaviour* - **Stereotyped and repetitive behaviors** (e.g., hand flapping, rocking, rigid adherence to routines) are a **core diagnostic criterion** for PDDs, including autism spectrum disorder. - These behaviors are part of the **restricted, repetitive patterns of behavior, interests, or activities** domain in diagnostic criteria. *Reduced social interaction* - Significant **deficits in social interaction and communication** are a **hallmark feature** of PDDs. - This manifests as difficulty with reciprocal social communication, impaired ability to interpret social cues, and challenges in forming age-appropriate peer relationships. *Poor language skills* - **Communication impairments**, including poor language skills, are a **common feature** of PDDs, especially in classical autism. - This can include delayed speech development, unusual language patterns (e.g., **echolalia**, pronoun reversal), or complete absence of verbal communication in severe cases.
Question 5: Subtelomeric rearrangement of genes is frequently associated with intellectual disability. All of the following techniques can be used to diagnose them except:
- A. MALDI (Correct Answer)
- B. FISH
- C. MAPH
- D. cGH array
Explanation: ***MALDI*** - **Matrix-assisted laser desorption/ionization (MALDI)** is a soft ionization technique used in mass spectrometry for analyzing biomolecules like proteins and peptides. - It is not suitable for detecting large-scale chromosomal rearrangements such as **subtelomeric deletions or duplications**. *FISH* - **Fluorescence in situ hybridization (FISH)** uses fluorescent DNA probes that bind to specific target regions on chromosomes, allowing for the detection of deletions or duplications [1]. - **Subtelomeric FISH** specifically targets the ends of chromosomes and is a common method for identifying subtelomeric rearrangements [1]. *MAPH* - **Multiplex amplifiable probe hybridization (MAPH)** is a technique used for detecting copy number variations (CNVs), including deletions and duplications, in specific genomic regions. - It can be applied to **subtelomeric regions** by designing probes specific to those areas, making it useful for diagnosing subtelomeric rearrangements. *CGH array* - **Comparative genomic hybridization array (CGH array)** is a high-resolution method that compares the patient's DNA to a control DNA to detect unbalanced chromosomal abnormalities across the entire genome [1]. - It is highly effective in identifying **copy number changes**, including subtelomeric deletions and duplications, associated with intellectual disability [1], [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, pp. 186-187. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, p. 187.
Question 6: A 5-year-old child is assessed to have a developmental age of one year. What is his developmental quotient?
- A. 100
- B. 80
- C. 60
- D. 20 (Correct Answer)
Explanation: ***20*** - The **developmental quotient (DQ)** is calculated as (developmental age ÷ chronological age) × 100. In this case, (1 year ÷ 5 years) × 100 = 20. - A DQ of 20 indicates a significant **developmental delay**, as the child's developmental age is much lower than their chronological age. *100* - A developmental quotient of 100 would mean the child's **developmental age is equal to their chronological age**, indicating typical development. - In this scenario, it would imply a 5-year-old child having a developmental age of 5 years, which is not the case. *80* - A developmental quotient of 80 would mean the child's developmental age is 80% of their chronological age, or (4 years ÷ 5 years) × 100. - This would still indicate some developmental delay, but not as severe as observed, as the child's developmental age is only 1 year. *60* - A developmental quotient of 60 would mean the child's developmental age is 60% of their chronological age, or (3 years ÷ 5 years) × 100. - While indicating a delay, it is not consistent with a 1-year developmental age for a 5-year-old child.
Question 7: A neonate presents with the clinical features shown in the image below. What is the most likely diagnosis?
- A. Down syndrome
- B. Congenital hypothyroidism (Correct Answer)
- C. Ellis-Van Creveld syndrome
- D. Turner syndrome
Explanation: ***Congenital hypothyroidism*** - The image shows a neonate with **macroglossia** (large tongue), **umbilical hernia**, and possibly **puffy eyelids** and **dull facies**, all characteristic signs of congenital hypothyroidism. - Other features often include **hypotonia**, **feeding difficulties**, **prolonged jaundice**, and **constipation**. *Down syndrome* - While Down syndrome can present with **hypotonia** and some shared features, the characteristic **epicanthal folds**, **simian crease**, **brushfield spots**, and flattened facial profile are not clearly evident. - Macroglossia is common but other features like an umbilical hernia would be less specific. *Ellis-Van Creveld syndrome* - This syndrome is characterized by **chondroectodermal dysplasia**, typically presenting with **polydactyly**, **short-limbed dwarfism**, **nail dysplasia**, and **cardiac defects**. - These distinct skeletal and ectodermal abnormalities are not visible in the presented image. *Turner syndrome* - Turner syndrome (XO karyotype) primarily affects females and is characterized by **short stature**, **webbed neck**, **lymphedema of hands and feet**, and **cardiac anomalies** (e.g., coarctation of the aorta). - The features shown in the image, such as macroglossia and umbilical hernia, are not typical of Turner syndrome.
Question 8: The given karyotype is seen in which of the following syndromes?
- A. Angelman syndrome
- B. Fragile x syndrome
- C. Down syndrome (Correct Answer)
- D. Turner syndrome
Explanation: ***Correct: Down syndrome*** - The karyotype shows **trisomy 21** (47 chromosomes with an extra chromosome 21), which causes **Down syndrome**. - This is the most common chromosomal abnormality, with characteristic karyotype showing **three copies of chromosome 21**. - Clinical features include intellectual disability, characteristic facies, and congenital heart defects. *Incorrect: Angelman syndrome* - Caused by **deletion or mutation of UBE3A gene** on chromosome 15, not trisomy 21. - Shows normal chromosomal number (46 chromosomes), unlike the **47 chromosomes** seen in this karyotype. - Characterized by developmental delay, seizures, and happy demeanor. *Incorrect: Fragile X syndrome* - Results from **CGG repeat expansion** in the FMR1 gene on the X chromosome. - Typically shows **normal karyotype structure** (46 chromosomes), not the **extra chromosome 21** visible here. - Most common inherited cause of intellectual disability. *Incorrect: Cri du chat syndrome* - Caused by **deletion on chromosome 5p**, which would show as a **missing chromosomal segment**. - The karyotype would show **46 chromosomes with 5p deletion**, not **47 chromosomes with trisomy 21**. - Named for characteristic cat-like cry in infancy. *Incorrect: Turner syndrome* - Results from **missing X chromosome** (45,X karyotype) in females. - Shows **45 chromosomes total**, not the **47 chromosomes with extra chromosome 21** seen here. - Presents with short stature and ovarian dysgenesis.
Question 9: The diagrammatic representation of the karyotype of an individual indicates a specific genetic abnormality. What is the diagnosis?
- A. Angelman syndrome
- B. Cri du Chat syndrome
- C. DiGeorge syndrome
- D. Prader-Willi syndrome (Correct Answer)
Explanation: ***Prader-Willi syndrome*** - The karyotype shows an abnormality on **chromosome 15**, which is consistent with Prader-Willi syndrome caused by **deletion of 15q11-q13** inherited from the **paternal** chromosome or **maternal uniparental disomy**. - While PWS deletions are typically **submicroscopic**, larger deletions can occasionally be visible on standard karyotyping, particularly when they represent **class I deletions** that are more extensive and involve additional chromosomal material beyond the typical PWS critical region. *Angelman syndrome* - Although Angelman syndrome also involves **chromosome 15q11-q13 deletion**, it results from **maternal** deletion or **paternal uniparental disomy**, and presents with distinctly different clinical features. - Clinical presentation includes **severe intellectual disability**, **ataxia**, **seizures**, **absent speech**, and **inappropriate laughter** (happy demeanor), which differs significantly from the PWS phenotype. *DiGeorge syndrome* - DiGeorge syndrome is caused by **deletion of chromosome 22q11.2**, not chromosome 15 as shown in the karyotype. - Clinical features include **cardiac defects** (conotruncal abnormalities), **thymic hypoplasia**, **parathyroid hypoplasia** (hypocalcemia), **cleft palate**, and characteristic facial features (CATCH-22 syndrome). *Cri du Chat syndrome* - This syndrome results from **deletion of chromosome 5p** (short arm of chromosome 5), not chromosome 15 as indicated in the karyotype. - Characteristic features include **high-pitched cry** resembling a cat's meow in infancy, **intellectual disability**, **microcephaly**, and **distinctive facial features**.
Question 10: In a child with IQ 50, which of the following is true:
- A. Can look after himself independently
- B. Can handle money
- C. Can follow simple verbal commands (Correct Answer)
- D. All of the options
Explanation: ***Can follow simple verbal commands*** - An IQ of 50 typically falls into the **moderate intellectual disability** range (IQ 35-50), where individuals can understand and follow **simple instructions** and commands. - This level often allows for some degree of **communication and basic learning** with appropriate support and training. *Can look after himself independently* - While individuals with an IQ of 50 may achieve some level of independence with training, **full self-care** in complex situations typically requires ongoing support or supervision. - They may struggle with **complex problem-solving** or managing all aspects of independent living without guidance. *Can handle money* - Handling money, including budgeting, making change, or understanding financial transactions, is a **complex skill** that is often challenging for individuals with an IQ of 50 without significant training and support. - They may understand the basic concept of money but struggle with its practical application in varied scenarios. *All of the options* - While simple verbal commands are usually manageable, the other options (full independent self-care and complex money handling) are typically beyond the general capabilities of an individual with an IQ of 50 without substantial support or specific, intensive training. - Therefore, not all listed options accurately describe the expected functional abilities.
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