Postnatal Growth and Development — MCQs

10 questions

Which of the following conditions is characterized by webbing of the neck, short stature, increased carrying angle, low posterior hairline, primary amenorrhea, and short fourth metacarpal?

Bone age is advanced in which of the following conditions?

Which of the following is a primary determinant of undernutrition?

A girl presents with primary amenorrhea, grade V thelarche (mature breast), grade II pubarche (sparse growth of pubic hair) and no axillary hair. Likely diagnosis is:

Absence of which of the given milestones in a 3 year old child should be called delayed development?

The normal growth of the human eye includes all except

Which of the following is not a feature of hypothyroidism in infancy?

All are true about anthropometric measures except

A 2-day-old neonate under phototherapy unit. For exchange transfusion serum bilirubin-albumin ratio should be: (Recent NEET Pattern 2016-17)

Q10Easy

Which paranasal sinuses are present at birth?

Postnatal Growth and Development Indian Medical PG Practice Questions and MCQs

Question 1: Which of the following conditions is characterized by webbing of the neck, short stature, increased carrying angle, low posterior hairline, primary amenorrhea, and short fourth metacarpal?

A. Klinefelter syndrome
B. Turner syndrome (Correct Answer)
C. Cri-du-chat syndrome
D. Noonan syndrome
E. Down syndrome

Explanation: ***Turner syndrome*** - Characterized by **webbing of the neck**, **short stature**, and **primary amenorrhea**, which are classic features of Turner syndrome [1][2]. - The presence of a **short fourth metacarpal** is also a specific skeletal manifestation associated with this condition. - **Short stature** in Turner syndrome is specifically explained by haploinsufficiency of the SHOX gene [1]. *Noonan syndrome* - Presents with features like **short stature** and **cardiac anomalies**, but lacks the specific manifestations of neck webbing and primary amenorrhea. - Typically associated with facial dysmorphisms, such as **widely spaced eyes** and a **distinctive appearance** which are not mentioned here. *Klinefelter syndrome* - Characterized by **47,XXY** karyotype leading to **gynecomastia** and **testicular atrophy**, rather than symptoms like webbed neck or short stature. - Men with this syndrome usually display **delayed or incomplete puberty**, not primary amenorrhea. *Cri-du-chat syndrome* - Primarily associated with a **distinctive high-pitched cry** and developmental delays, rather than physical traits like webbed neck or short fourth metacarpal. - Symptoms are more related to **chromosomal deletion** and do not include amenorrhea or features typical of Turner syndrome. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, pp. 175-177. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, pp. 173-174.

Question 2: Bone age is advanced in which of the following conditions?

A. Congenital adrenal hyperplasia (Correct Answer)
B. Hypothyroidism
C. Hypopituitarism
D. Constitutional delay in growth

Explanation: ***Congenital adrenal hyperplasia*** - In **congenital adrenal hyperplasia (CAH)**, the adrenal glands produce excessive androgens, leading to precocious puberty and **accelerated skeletal maturation**, thus advancing bone age. - The excess androgens cause early fusion of the **epiphyseal growth plates**, leading to a disproportionately taller stature in childhood but potentially shorter adult height. *Hypothyroidism* - **Hypothyroidism** causes delayed growth and development, including **delayed bone age**, due to insufficient thyroid hormone which is crucial for normal skeletal maturation. - Children with hypothyroidism typically have shorter stature for their chronological age and delayed ossification of epiphyses. *Hypopituitarism* - **Hypopituitarism**, especially growth hormone deficiency, leads to **delayed bone age** and significantly stunted growth because growth hormone is essential for normal skeletal development. - Insufficient growth hormone results in slower epiphyseal growth and delayed growth plate closure. *Constitutional delay in growth* - **Constitutional delay in growth and puberty** is characterized by a "late bloomer" pattern, where both linear growth and pubertal development are delayed, resulting in a **delayed bone age**. - These children typically have normal growth velocity for their bone age and will eventually reach a normal adult height, just later than their peers.

Question 3: Which of the following is a primary determinant of undernutrition?

A. Infections
B. Low birth weight
C. Less water intake
D. Low food intake (Correct Answer)

Explanation: ***Low food intake*** - **Low food intake**, meaning insufficient consumption of food, directly leads to a lack of essential nutrients and energy, which is the most fundamental cause of **undernutrition**. - This can be due to various factors like poverty, food insecurity, poor dietary choices, or conditions causing appetite loss, all converging on inadequate nutrient supply. *Low birth weight* - **Low birth weight** is often a *consequence* or a *marker* of undernutrition in the mother or during fetal development, rather than a primary determinant of subsequent undernutrition itself. - While it increases the risk of health problems, including future undernutrition, it's not the initial cause of nutrient deficiency. *Infections* - **Infections** can *exacerbate* undernutrition by increasing nutrient requirements, impairing nutrient absorption, and causing appetite loss. - However, infections are often risk factors or consequences of an already weakened nutritional state, rather than the initial, direct cause of a nutrient deficit. *Less water intake* - **Less water intake** primarily leads to **dehydration**, which affects overall health and nutrient transport but is not a direct cause of **undernutrition** (i.e., a lack of essential calories, proteins, vitamins, and minerals). - While hydration is crucial for health, it is distinct from the intake of macronutrients and micronutrients that define nutritional status.

Question 4: A girl presents with primary amenorrhea, grade V thelarche (mature breast), grade II pubarche (sparse growth of pubic hair) and no axillary hair. Likely diagnosis is:

A. Turner syndrome
B. Testicular feminization (Correct Answer)
C. Gonadal dysgenesis
D. Mullerian agenesis

Explanation: Androgen Insensitivity Syndrome (also known as testicular feminization) is characterized by a phenotype where primary amenorrhea occurs in a girl with mature (Grade V) breast development but sparse or absent pubic and axillary hair (Grade II pubarche). In this condition, androgens are produced but their receptors are non-functional, leading to normal breast development through the peripheral conversion of androgens to estrogens while inhibiting androgen-dependent hair growth [3]. *Turner syndrome* - Characterized by gonadal dysgenesis [1], leading to primary amenorrhea and absent or rudimentary breast development (grade I thelarche). Patients typically present with characteristic physical features such as short stature [1], webbed neck, and coarctation of the aorta, which are not mentioned here. *Gonadal dysgenesis* - This is a broader term for abnormal development of the gonads [2], often leading to primary amenorrhea and lack of secondary sexual characteristics [1]. Unlike the described case, individuals with gonadal dysgenesis would not have mature breast development. *Mullerian agenesis* - Presents with primary amenorrhea due to the absence or hypoplasia of the uterus and upper vagina, but normal ovarian function. Patients with Mullerian agenesis would typically have normal breast development and normal pubic and axillary hair growth, as their androgen receptors are functional.

Question 5: Absence of which of the given milestones in a 3 year old child should be called delayed development?

A. Hopping on one leg
B. Catching a ball reliably
C. Drawing a square
D. Feeding by spoon (Correct Answer)

Explanation: ***Feeding by spoon*** - The ability to **feed oneself with a spoon** is typically achieved by **15 to 18 months of age**, making its absence in a 3-year-old a sign of delayed development. - This milestone reflects both **fine motor coordination** and **self-help skills**. *Hopping on one leg* - **Hopping on one leg** is a gross motor skill usually developed between **4 and 5 years of age**, so a 3-year-old not yet doing this is within the normal developmental range. - This skill requires advanced **balance** and **coordination**. *Catching a ball reliably* - **Catching a ball reliably** typically emerges around **4 to 5 years of age**, as it requires good **hand-eye coordination** and **anticipation skills**. - A 3-year-old's inability to catch a ball reliably is not considered delayed. *Drawing a square* - The ability to **draw a square** is usually achieved by **4 to 5 years of age**, requiring fine motor precision and visuomotor integration. - At 3 years, children are more likely to be able to copy a **circle** or **vertical line**.

Question 6: The normal growth of the human eye includes all except

A. Dramatic decrease in lens power in first one year
B. A 4 mm increase in axial length in first 6 months of life
C. An increase in corneal power in first 6 months (Correct Answer)
D. A corneal diameter of 10.5 mm at birth, 12mm by age 2

Explanation: ***An increase in corneal power in first 6 months*** - Normal physiological development of the human eye involves a **decrease in corneal power** during the first 6 months of life. This emmetropization process helps the eye achieve a clearer focus as it grows. - An increase in corneal power would typically lead to **myopic shifts** or other refractive errors if not compensated by other ocular changes. *Dramatic decrease in lens power in first one year* - The human lens is highly positive at birth (around +34.50 D) and undergoes a significant physiological decrease in power during the **first year of life** as part of the emmetropization process. - This reduction in lens power, coupled with the increase in axial length, helps the eye achieve **emmetropia** (normal refractive state). *A 4 mm increase in axial length in first 6 months of life* - The eye undergoes rapid growth after birth, with the axial length increasing significantly, particularly in the **first 6 months of life**. - A 4 mm increase in axial length during this period is an expected part of **normal ocular development** contributing to emmetropization. *A corneal diameter of 10.5 mm at birth, 12mm by age 2* - The average corneal diameter at birth is approximately **9.0 mm to 10.5 mm**, rapidly increasing to about 11.5 mm by age 1 and reaching its adult size of around **12 mm by age 2** to 3 years. - This growth in corneal diameter is a normal part of ocular development and contributes to the overall enlargement of the eye globe.

Question 7: Which of the following is not a feature of hypothyroidism in infancy?

A. Umbilical hernia
B. Constipation
C. Coarse facies
D. Premature closure of posterior fontanelle (Correct Answer)

Explanation: ***Premature closure of posterior fontanelle*** - Delayed closure of fontanelles, particularly the **posterior fontanelle**, is a characteristic feature of **congenital hypothyroidism** due to impaired bone maturation. - Therefore, **premature closure** would be inconsistent with a diagnosis of hypothyroidism in infancy. *Coarse facies* - **Coarse facial features** such as a broad nasal bridge, puffy eyelids, and a protuberant tongue are common manifestations of **congenital hypothyroidism** due to the accumulation of glycosaminoglycans. - This is a direct consequence of the metabolic derangements caused by insufficient thyroid hormone. *Umbilical hernia* - An **umbilical hernia** is frequently observed in infants with hypothyroidism, resulting from generalized **hypotonia** and incomplete closure of the umbilical ring. - The reduced muscle tone characteristic of the condition contributes to this physical finding. *Constipation* - **Constipation** is a common gastrointestinal symptom in infants with hypothyroidism, caused by **decreased gut motility** secondary to reduced thyroid hormone levels. - This is a clinical indicator of the systemic metabolic slowing associated with the condition.

Question 8: All are true about anthropometric measures except

A. Skinfold thickness is measured in subscapular region
B. Standing height is about 1.7cms less than the recumbent length
C. Birth weight triples by 1yr
D. Weight is measured to the nearest 100gms (Correct Answer)

Explanation: ***Weight is measured to the nearest 100gms*** - This statement is **INCORRECT** and represents an inadequate level of precision for anthropometric assessment. - **Standard practice in pediatric anthropometry:** - **Infants and young children**: Weight should be measured to the nearest **10 grams (0.01 kg)** for accurate growth monitoring - **Older children**: Weight measured to the nearest **50-100 grams** depending on the scale - **Adults**: Typically measured to the nearest **100 grams** - Since this question is in a pediatric context, stating weight is measured "to the nearest 100gms" is too imprecise and does not meet the standards for accurate **growth monitoring** in children. *Skinfold thickness is measured in subscapular region* - **TRUE statement** - Skinfold thickness is commonly measured at the **subscapular site** (below the inferior angle of the scapula). - Other standard sites include **triceps, biceps, and suprailiac** regions. - These measurements are used to assess **body composition** and estimate body fat percentage. *Standing height is about 1.7cms less than the recumbent length* - **TRUE statement** - Standing height is typically **1.5 to 2.0 cm less** than recumbent (supine) length. - This difference occurs because gravity compresses the **intervertebral discs** and affects spinal curvature when standing. - **1.7 cm is an accurate approximation** within this range. - This is why recumbent length is measured in children <2 years, while standing height is measured in older children. *Birth weight triples by 1yr* - **TRUE statement** - A healthy infant's birth weight typically **triples by 12 months** of age. - Additional growth milestones: Birth weight **doubles by 4-6 months** and **quadruples by 2 years**. - This is a well-established developmental milestone used to assess **normal growth and nutrition** in infants.

Question 9: A 2-day-old neonate under phototherapy unit. For exchange transfusion serum bilirubin-albumin ratio should be: (Recent NEET Pattern 2016-17)

A. $>3.5$ (Correct Answer)
B. $<3.5$
C. $>35$
D. $<35$

Explanation: ***$>3.5$*** - A **serum bilirubin-albumin ratio greater than 3.5** is a common guideline indicating the need for exchange transfusion in neonates, especially those at high risk or with rapidly rising bilirubin levels. - This ratio helps assess the risk of **bilirubin-induced neurotoxicity (kernicterus)**, as unbound (free) bilirubin can cross the blood-brain barrier [1]. *$<3.5$* - A bilirubin-albumin ratio **less than 3.5** typically suggests a lower risk of neurotoxicity and may indicate that phototherapy is sufficient to manage hyperbilirubinemia [2]. - In such cases, the **binding capacity of albumin** for bilirubin is considered adequate to prevent significant free bilirubin accumulation [1]. *$>35$* - A serum bilirubin-albumin ratio of **greater than 35** would represent an extremely high and clinically improbable value. - Clinically, the bilirubin-albumin ratio is typically used with values in the single digits, making a value of 35 or higher incongruent with standard medical guidelines. *$<35$* - While technically true that $<35$ would include the correct threshold, it is not sufficiently specific to denote the critical value for exchange transfusion. - This range is too broad and does not pinpoint the specific bilirubin-albumin ratio that prompts intervention.

Question 10: Which paranasal sinuses are present at birth?

A. Frontal and maxillary
B. Ethmoid and maxillary (Correct Answer)
C. Frontal and ethmoid
D. Sphenoid and ethmoid

Explanation: The development of paranasal sinuses is a high-yield topic in embryology. At birth, only the **maxillary** and **ethmoid** sinuses are present and pneumatized enough to be clinically identifiable, though they are rudimentary in size. 1. **Maxillary Sinus:** This is the first sinus to develop (around the 3rd month of fetal life). At birth, it is a small sac measuring approximately 7 x 4 x 4 mm. 2. **Ethmoid Sinus:** These air cells are present at birth and continue to enlarge during early childhood. **Analysis of Incorrect Options:** * **Frontal Sinus:** This sinus is **absent at birth**. It starts developing from the anterior ethmoidal cells around the age of 2 and is usually not radiologically visible until age 5–7. * **Sphenoid Sinus:** While a tiny evagination may exist at birth, it is effectively **absent/non-pneumatized**. It begins to invade the sphenoid bone around age 3 and reaches full development in adolescence. **High-Yield Clinical Pearls for NEET-PG:** * **Sequence of Development:** Maxillary → Ethmoid → Sphenoid → Frontal (Mnemonic: **M**y **E**xtra **S**pecial **F**riend). * **Radiology:** The frontal sinus is the last to appear on an X-ray. * **Clinical Correlation:** Because the frontal and sphenoid sinuses are absent at birth, sinusitis in infants typically only involves the ethmoid or maxillary sinuses. * **Growth:** The maxillary sinus shows a rapid growth spurt during the eruption of permanent teeth.

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