Normal Pediatric Developmental Anatomy — MCQs
A child presents with poor growth and swelling at joints. A radiograph of his wrist is given below. Lab investigations reveal serum ALP levels of >1500. What is the possible diagnosis?
Air bronchogram on chest X-ray denotes -
Bone age is advanced in which of the following conditions?
At what age does the anterior fontanelle typically close?
A child presents with short stature. His bone age is less than chronological age. The height of his parents is normal. What is the most likely diagnosis?
A child comes with cyanotic spells and chest X-ray was as shown below; What is the most probable diagnosis?
A child with lymphoma shows 'ivory vertebra' sign. Best imaging modality for evaluation?
The given karyotype is seen in which of the following syndromes?
In the condition shown below, rib notching is present in which of the following ribs? (AIIMS Nov 2015)
Which of the following liver metastases appear hypoechoic on ultrasound?
Normal Pediatric Developmental Anatomy Indian Medical PG Practice Questions and MCQs
Question 1: A child presents with poor growth and swelling at joints. A radiograph of his wrist is given below. Lab investigations reveal serum ALP levels of >1500. What is the possible diagnosis?
- A. Rickets (Correct Answer)
- B. Osteoporosis
- C. Osteomalacia
- D. Osteogenesis imperfecta
Explanation: ***Rickets*** - The combination of **poor growth**, **joint swelling**, and **elevated alkaline phosphatase (ALP)** in a child strongly indicates rickets, a condition of defective bone mineralization in growing bones. - The radiograph of the wrist would likely show typical findings like **widened growth plates**, **fraying** and **cupping of metaphyses**, and **decreased bone density**, which are characteristic of rickets. *Osteoporosis* - This condition is characterized by **reduced bone mass** and **fragile bones**, typically seen in older adults or due to secondary causes, and is not primarily linked to joint swelling in children. - While ALP levels can be normal or slightly elevated in osteoporosis, a level of >1500 is highly suggestive of active bone formation or breakdown, not typically seen in osteoporosis. *Osteomalacia* - This is defective bone mineralization in adults after growth plates have fused, leading to **bone softening** and **pain**, typically not presenting with joint swelling as a primary symptom. - While it also involves high ALP and bone demineralization, the clinical context of a *child* with growth issues points more specifically to rickets. *Osteogenesis imperfecta* - This is a group of **genetic disorders** characterized by **brittle bones** that fracture easily, often accompanied by **blue sclerae** and **hearing loss**, which are not mentioned in the presentation. - While bone fragility is present, it does not typically cause the described joint swelling or the significantly elevated ALP levels seen in this case.
Question 2: Air bronchogram on chest X-ray denotes -
- A. Intrapulmonary lesion (Correct Answer)
- B. Extrapulmonary lesion
- C. Intrathoracic lesion
- D. Extrathoracic lesion
Explanation: ***Intrapulmonary lesion*** - An **air bronchogram** indicates that the air-filled bronchi are surrounded by consolidated or fluid-filled alveoli, making the bronchi visible against the opacified lung parenchyma. - This pattern is a strong sign of a process **within the lung tissue itself**, such as pneumonia, pulmonary edema, or malignancy. *Extrapulmonary lesion* - **Extrapulmonary lesions**, such as pleural effusions or masses originating from the chest wall, typically displace or compress the lung and bronchi, rather than filling the alveoli around them. - They usually do **not produce an air bronchogram** because the air in the bronchi is not juxtaposed against diseased lung parenchyma. *Intrathoracic lesion* - This is a broad term that includes all lesions within the thoracic cavity, both intrapulmonary and extrapulmonary. - While an air bronchogram is an intrathoracic finding, it specifically points to an **intrapulmonary process**, not just any intrathoracic lesion. *Extrathoracic lesion* - **Extrathoracic lesions** are located outside the chest cavity and would not manifest as an air bronchogram on a chest X-ray. - This option is **completely unrelated** to the interpretation of an air bronchogram.
Question 3: 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 4: At what age does the anterior fontanelle typically close?
- A. Before 3 months
- B. At 12 months
- C. Between 12 and 18 months (Correct Answer)
- D. After 3 years
Explanation: ***Between 12 and 18 months*** - The anterior fontanelle typically closes between **12 and 18 months** of age, allowing for significant brain growth during infancy. - This timeframe is crucial for monitoring **head circumference growth** and detecting potential issues like microcephaly or hydrocephalus. *Before 3 months* - Closure of the anterior fontanelle before 3 months, or very early, can be a sign of **craniosynostosis**, requiring medical evaluation. - Most infants still have a palpable anterior fontanelle at this age. *At 12 months* - While some fontanelles may close around 12 months, the normal range extends further, up to 18 months. - A fontanelle still open at 12 months is generally considered normal. *After 3 years* - Delayed closure beyond 2 years or 3 years can indicate underlying conditions such as **hydrocephalus**, **rickets**, **hypothyroidism**, or other developmental disorders. - In such cases, further investigation is warranted.
Question 5: A child presents with short stature. His bone age is less than chronological age. The height of his parents is normal. What is the most likely diagnosis?
- A. Malnutrition
- B. Familial short stature
- C. Constitutional short stature (Correct Answer)
- D. Cretinism
Explanation: ***Constitutional short stature*** - This condition is characterized by a **delayed bone age** compared to chronological age, indicating a delay in skeletal maturation. - Children with constitutional short stature typically have **normal parental height** and will eventually reach a normal adult height, although puberty and growth spurts are often delayed. *Malnutrition* - While malnutrition causes **short stature** and **delayed bone age**, it would also likely present with other signs of nutritional deficiency such as **weight loss** or failure to thrive. - The case does not mention any dietary issues or poor socioeconomic conditions typically associated with malnutrition. *Familial short stature* - In familial short stature, the child's height is typically proportional to the parents' height, indicating a strong genetic component to their shorter stature. - It is characterized by a **normal bone age** for chronological age, unlike the delayed bone age seen in this child. *Cretinism* - Cretinism, or congenital hypothyroidism, results in **severe growth retardation** and **delayed bone age**. - However, it is also associated with distinct features like **coarse facial features**, macroglossia, umbilical hernia, and severe developmental delays, which are not mentioned in this case.
Question 6: A child comes with cyanotic spells and chest X-ray was as shown below; What is the most probable diagnosis?
- A. Tricuspid atresia
- B. Tetralogy of Fallot (Correct Answer)
- C. TAPVC
- D. Pulmonary atresia with intact ventricular septum
Explanation: ***Tetralogy of Fallot*** - The **boot-shaped heart** (Coeur en sabot) seen on the chest X-ray is virtually pathognomonic for **Tetralogy of Fallot** due to right ventricular hypertrophy and a concave pulmonary artery segment. - **Cyanotic spells** (hypercyanotic or "tet" spells) are characteristic clinical features resulting from increased right-to-left shunting across the ventricular septal defect. *Tricuspid atresia* - While tricuspid atresia causes **cyanosis**, the classic radiographic finding is usually a **small right ventricle** and a large left ventricle, affecting heart size and shape differently, often with normal or decreased pulmonary vascularity. - A **boot-shaped heart** is not a typical finding; it might show a normal or slightly enlarged heart with distinct chamber enlargement patterns. *TAPVC* - Total anomalous pulmonary venous connection (TAPVC) typically presents with **cyanosis** and can have increased pulmonary vascular markings on CXR, but the classic X-ray finding is a **"snowman" or "figure-of-8" heart** in the supracardiac type due to dilated SVC and anomalous vertical vein. - A **boot-shaped heart** is not associated with TAPVC. *Pulmonary atresia with intact ventricular septum* - This condition presents with **severe cyanosis** at birth. The chest X-ray typically shows a **markedly enlarged right atrium** due to severe tricuspid regurgitation and a small, hypoplastic right ventricle, along with decreased pulmonary vascular markings. - A **boot-shaped heart** is not a characteristic finding; the cardiac silhouette is often described as globular or enlarged differently.
Question 7: A child with lymphoma shows 'ivory vertebra' sign. Best imaging modality for evaluation?
- A. Plain X-ray
- B. MRI spine (Correct Answer)
- C. CT spine
- D. Bone scan
Explanation: ***MRI spine*** - **MRI** is the **most sensitive and specific** imaging modality for evaluating bone marrow infiltration in lymphoma, especially detecting the **'ivory vertebra' sign** (diffuse uniform sclerotic density). - It provides excellent soft tissue contrast, allowing for detailed visualization of **vertebral body involvement**, **bone marrow infiltration**, and **spinal cord compression**, which are critical in managing lymphoma. - MRI superior for assessing **extent of marrow replacement** and detecting **soft tissue masses** associated with lymphomatous involvement. *Plain X-ray* - While a plain X-ray might show the **'ivory vertebra' sign** as increased homogeneous bone density, it has **limited sensitivity** for early or subtle bone marrow changes. - It is often insufficient for comprehensive staging or assessing the full extent of **vertebral and paravertebral soft tissue involvement** in lymphoma. *CT spine* - **CT scans** excel at evaluating **cortical bone involvement** and detecting sclerotic changes but are less sensitive than MRI for detecting subtle **marrow infiltration** and soft tissue components. - While it can clearly depict the sclerotic density of **'ivory vertebra'**, it exposes the patient to **ionizing radiation** and offers inferior soft tissue resolution for bone marrow changes and epidural extension compared to MRI. *Bone scan* - **Bone scans** are sensitive for detecting **increased osteoblastic activity** and skeletal involvement but are **non-specific**, meaning they can indicate bone abnormalities without precisely defining the cause or extent. - While it can identify areas of **increased uptake** in lymphomatous bone involvement, it doesn't provide the detailed anatomical resolution needed to characterize the vertebral changes or assess **spinal cord compression** as effectively as MRI.
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: In the condition shown below, rib notching is present in which of the following ribs? (AIIMS Nov 2015)
- A. 3rd to 9th ribs (Correct Answer)
- B. 1st to 9th ribs
- C. 11th and 12th ribs
- D. All ribs
Explanation: **3rd to 9th ribs** - The image provided depicts **coarctation of the aorta**, characterized by a narrowing of the aorta, typically distal to the origin of the left subclavian artery. - In coarctation of the aorta, collateral circulation develops through the **intercostal arteries** to bypass the constriction, leading to their enlargement and subsequent erosion of the inferior margins of the **3rd to 9th ribs**, a finding known as "rib notching." *1st to 9th ribs* - While rib notching affects upper ribs, it typically **spares the 1st and 2nd ribs** because the superior intercostal arteries (which supply these ribs) originate directly from the subclavian artery, often proximal to the coarctation, so they do not participate in collateral circulation as significantly. - The pattern of notching is usually more concentrated in the mid-thoracic region. *11th and 12th ribs* - Rib notching from coarctation of the aorta is rarely observed in the **floating ribs** (11th and 12th ribs). - These ribs have a different anatomical relationship with the pleura and typically do not bear the brunt of increased collateral flow from the intercostal arteries in the same way as the higher ribs. *All ribs* - Rib notching is a localized phenomenon reflecting increased blood flow through specific intercostal arteries involved in collateral circulation due to aortic coarctation. - Therefore, it does **not affect all ribs**, and its absence in certain ribs (like the 1st, 2nd, 11th, and 12th) helps differentiate this condition radiologically.
Question 10: Which of the following liver metastases appear hypoechoic on ultrasound?
- A. RCC
- B. Colon cancer
- C. Breast cancer (Correct Answer)
- D. Mucinous adenocarcinoma
Explanation: **Breast cancer** - Liver metastases from **breast cancer** frequently present as **hypoechoic lesions** on ultrasound, due to the tumor's cellular composition and vascularity. - This appearance helps differentiate them from other more commonly echogenic or mixed metastatic patterns. *RCC* - **Renal cell carcinoma (RCC)** metastases to the liver often appear **hyperechoic** or **mixed echogenicity** on ultrasound due to their rich vascularity. - This is a distinct characteristic, different from the predominantly hypoechoic nature seen with breast cancer metastases. *Colon cancer* - Liver metastases from **colon cancer** are typically **echogenic** or **mixed echogenicity** on ultrasound, sometimes with a hypoechoic rim ("target sign"). - Their presentation is generally not purely hypoechoic, making them distinguishable from breast cancer metastases. *Mucinous adenocarcinoma* - Liver metastases from **mucinous adenocarcinoma** can be quite variable, but they often appear **complex**, possibly with **cystic components** or mixed echogenicity, rather than uniformly hypoechoic. - The mucin content can create a distinct internal architecture on ultrasound that differs from solid hypoechoic lesions.
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