Nutritional Dermatoses in Children — MCQs
Deficiency of which element is specifically linked to the syndrome of growth failure, anemia, and hypogonadism?
Deficiency of which of the following micronutrients results in Menkes syndrome?
The skin changes seen in protein energy malnutrition can be due to deficiency of all of the following nutrients except:
Consider the following in respect of Salmon patch : 1. It is a hemangioma. 2. Its usual site is nape of neck. 3. It is common in children. 4. It needs surgical excision. Which of the statements given above are correct ?
Dermatological manifestation of which of the following diseases?
Which of the following statements is incorrect regarding nail changes in various conditions?
A child presents with a history of hypopigmented macules on the back, infantile spasms, and delayed milestones. What is the most likely diagnosis?
A 14-year-old boy presents with seizures and skin macules. What is the probable diagnosis?
In infancy, atopic dermatitis typically spares which of the following areas?
Ectodermal dysplasia is characterized by which of the following manifestations?
Nutritional Dermatoses in Children Indian Medical PG Practice Questions and MCQs
Question 1: Deficiency of which element is specifically linked to the syndrome of growth failure, anemia, and hypogonadism?
- A. Calcium
- B. Copper
- C. Zinc (Correct Answer)
- D. Magnesium
Explanation: ***Zinc*** - **Zinc deficiency** is classically associated with **growth retardation**, **anemia**, **hypogonadism**, and impaired immune function due to its role in numerous enzymatic processes and DNA synthesis. - It plays a crucial role in **cellular growth**, development, and endocrine function, making its deficiency particularly impactful on these systems. *Calcium* - **Calcium deficiency** primarily leads to **bone demineralization** (osteoporosis or osteomalacia), tetany, and muscle cramps. - While essential for growth, it is not specifically linked to the triad of **anemia** and **hypogonadism** in the same manner as zinc. *Copper* - **Copper deficiency** can cause **anemia** (microcytic, unresponsive to iron), **neurological dysfunction** (myelopathy), and impaired immune function. - However, it is not typically associated with prominent **growth failure** and **hypogonadism** as a primary triad of symptoms. *Magnesium* - **Magnesium deficiency** can lead to **neuromuscular hyperexcitability** (tetany, spasms), cardiac arrhythmias, and fatigue. - It does not commonly present with the distinct combination of **growth failure**, **anemia**, and **hypogonadism**.
Question 2: Deficiency of which of the following micronutrients results in Menkes syndrome?
- A. Magnesium
- B. Copper (Correct Answer)
- C. Selenium
- D. Manganese
Explanation: **Copper** - **Menkes syndrome** is a genetic disorder caused by a defect in the **ATP7A gene**, leading to impaired cellular copper transport and severe **copper deficiency**. - This deficiency affects multiple organ systems, resulting in characteristic features like **kinky hair**, **neurological degeneration**, and connective tissue abnormalities. *Magnesium* - Magnesium deficiency is associated with conditions like **hypomagnesemia**, muscle weakness, and cardiac arrhythmias. - It plays crucial roles in enzyme function and nerve conduction but is not directly linked to Menkes syndrome. *Selenium* - Selenium deficiency can cause **Keshan disease** (cardiomyopathy) and **myxedematous endemic cretinism**. - While an essential trace element, its deficiency does not lead to Menkes syndrome. *Manganese* - Manganese is a cofactor for several enzymes involved in metabolism and antioxidant defense. - Deficiency is rare and typically presents with impaired growth and bone development, which are distinct from Menkes syndrome.
Question 3: The skin changes seen in protein energy malnutrition can be due to deficiency of all of the following nutrients except:
- A. Essential fatty acids
- B. Zinc
- C. Tryptophan
- D. Pyridoxine (Correct Answer)
Explanation: ***Pyridoxine*** - **Pyridoxine (vitamin B6)** deficiency can lead to **seborrheic dermatitis-like lesions**, glossitis, and cheilosis, but these are not the characteristic skin changes directly attributed to **protein-energy malnutrition (PEM)** itself. - While essential for many metabolic processes, its deficiency symptoms are distinct from the typical **dermatological manifestations of PEM**, such as those seen in kwashiorkor or marasmus [3]. *Essential fatty acids* - Deficiency of **essential fatty acids (EFAs)**, particularly **linoleic and alpha-linolenic acids**, can cause **scaly dermatitis**, **xerosis (dry skin)**, and **impaired skin barrier function**. - These conditions often contribute to the skin changes seen in **malnutrition**, making the skin more susceptible to infection and damage. *Zinc* - **Zinc deficiency** is a common complication of **protein-energy malnutrition** and can cause distinctive skin lesions, including **acrodermatitis enteropathica-like rash**, characterized by **vesiculobullous or pustular lesions** around body orifices and on the extremities. - It plays a crucial role in **skin integrity, wound healing**, and immune function, and its absence severely impacts cellular processes in the skin. *Tryptophan* - **Tryptophan** is an essential amino acid and a precursor to **niacin (vitamin B3)** [1]. - Deficiency can lead to **pellagra-like dermatosis**, characterized by the "necklace" sign, symmetrical, pigmented, and erythematous lesions on sun-exposed areas [2]. This is often seen in **severe protein-energy malnutrition** cases where overall intake of essential amino acids and vitamins is compromised.
Question 4: Consider the following in respect of Salmon patch : 1. It is a hemangioma. 2. Its usual site is nape of neck. 3. It is common in children. 4. It needs surgical excision. Which of the statements given above are correct ?
- A. 1, 3 and 4
- B. 1, 2 and 4
- C. 2 and 3 (Correct Answer)
- D. 1, 2 and 3
Explanation: ***2 and 3*** - **Salmon patches**, also known as nevus simplex or stork bites, are common capillary malformations occurring in up to 70% of newborns, making them common in children. - They frequently appear on the **nape of the neck**, eyelids, glabella, and forehead. *1, 3 and 4* - Salmon patches are **capillary malformations**, not true hemangiomas, which are benign vascular tumors. - They are typically benign and resolve spontaneously, and therefore **do not require surgical excision**. *1, 2 and 4* - Salmon patches are **capillary malformations**, not hemangiomas, and are common in children and usually found on the nape of the neck. - They are benign and **do not require surgical excision**, as most fade spontaneously. *1, 2 and 3* - Salmon patches are a type of **capillary malformation**, distinct from hemangiomas. - While they are common in children and often found on the nape of the neck, they are not hemangiomas.
Question 5: Dermatological manifestation of which of the following diseases?
- A. Photo dermatitis
- B. Pellagra (Correct Answer)
- C. Acrodermatitis enteropathica
- D. Vitamin B deficiency
Explanation: ***Pellagra*** - The image shows a classic "butterfly" rash on the face, specifically a photosensitive dermatitis, which is a hallmark of **pellagra**. - Pellagra is caused by a deficiency of **niacin (vitamin B3)**, characterized by the "3 D's": **dermatitis**, **diarrhea**, and **dementia**. *Photo dermatitis* - While pellagra often presents with photosensitive dermatitis, "photo dermatitis" is a general term for **skin inflammation caused by light exposure** and not a specific disease itself. - It could be caused by various factors, including medication, immune reactions, or other underlying conditions, but the pattern seen here is highly suggestive of pellagra. *Acrodermatitis enteropathica* - This condition is a **hereditary zinc deficiency** that typically presents with a periorificial and acral dermatitis. - The skin lesions are typically **vesicular-pustular or eczematous** and do not usually have the distinct butterfly pattern of photosensitive dermatitis seen in the image. *Vitamin B deficiency* - While pellagra is a vitamin B **(niacin, B3)** deficiency, this option is too broad. - Other vitamin B deficiencies, such as **riboflavin (B2)** or **pyridoxine (B6)** deficiency, have different dermatological manifestations like angular cheilitis, glossitis, or seborrheic dermatitis, but not the characteristic facial rash seen here.
Question 6: Which of the following statements is incorrect regarding nail changes in various conditions?
- A. Onycholysis is seen in Psoriasis.
- B. Mees lines are indicative of Arsenic poisoning.
- C. Pterygium of nails is associated with Lichen Planus.
- D. Koilonychia is associated with Vitamin B12 deficiency. (Correct Answer)
Explanation: ***Koilonychia is associated with Vitamin B12 deficiency.*** - **Koilonychia**, or "spoon nails," is primarily associated with **iron deficiency anemia**, not Vitamin B12 deficiency. - In Koilonychia, the nails become **thin, brittle**, and concave in shape. *Onycholysis is seen in Psoriasis.* - **Onycholysis** refers to the separation of the nail plate from the nail bed, which is a common nail finding in **psoriasis**. - Other nail changes in psoriasis include **pitting**, oil spots, and subungual hyperkeratosis. *Mees lines are indicative of Arsenic poisoning.* - **Mees lines** are transverse white lines or bands that appear across the nail plate, characteristic of severe illness or poisoning. - They are classically associated with **arsenic poisoning**, but can also be seen in other conditions like thallium poisoning or kidney failure. *Pterygium of nails is associated with Lichen Planus.* - **Pterygium unguis** involves the forward growth of the proximal nail fold (cuticle) onto the nail plate, leading to fusion. - It is a prominent and often distinguishing feature of **lichen planus** affecting the nails, which can lead to permanent nail deformity or loss.
Question 7: A child presents with a history of hypopigmented macules on the back, infantile spasms, and delayed milestones. What is the most likely diagnosis?
- A. Neurofibromatosis
- B. Sturge-Weber syndrome
- C. Tuberous sclerosis (Correct Answer)
- D. Nevus anemicus
Explanation: ### Explanation **Correct Answer: C. Tuberous Sclerosis (TSC)** The clinical triad of **hypopigmented macules (Ash-leaf spots)**, **infantile spasms** (West Syndrome), and **delayed milestones** is classic for Tuberous Sclerosis Complex. * **Pathophysiology:** TSC is an autosomal dominant neurocutaneous syndrome caused by mutations in the *TSC1* (Hamartin) or *TSC2* (Tuberin) genes, leading to the overactivation of the mTOR pathway and the formation of hamartomas in multiple organs. * **Dermatological markers:** Ash-leaf spots are often the earliest sign. Other features include Adenoma sebaceum (angiofibromas), Shagreen patches (connective tissue nevi), and periungual fibromas (Koenen tumors). * **Neurological markers:** Cortical tubers and subependymal nodules lead to seizures (infantile spasms) and intellectual disability. **Why Incorrect Options are Wrong:** * **A. Neurofibromatosis:** Characterized by *hyperpigmented* Café-au-lait macules, Lisch nodules, and neurofibromas, rather than hypopigmentation and infantile spasms. * **B. Sturge-Weber Syndrome:** Presents with a Port-wine stain (Nevus Flammeus) in the V1/V2 distribution of the trigeminal nerve, glaucoma, and leptomeningeal angiomas. * **C. Nevus Anemicus:** A localized vascular anomaly presenting as a pale patch due to catecholamine sensitivity. It does not cause systemic neurological symptoms or developmental delay. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest sign:** Ash-leaf spots (best seen under **Wood’s lamp**). * **Most common heart lesion:** Rhabdomyoma (often regresses spontaneously). * **Most common kidney lesion:** Angiomyolipoma. * **Drug of choice for Infantile Spasms in TSC:** Vigabatrin. * **Pathognomonic sign:** Koenen tumors (Periungual fibromas).
Question 8: A 14-year-old boy presents with seizures and skin macules. What is the probable diagnosis?
- A. Sturge-Weber syndrome
- B. Turcot syndrome
- C. Tuberous sclerosis (Correct Answer)
- D. Von Hippel-Lindau disease
Explanation: ### Explanation **Correct Answer: C. Tuberous Sclerosis (TSC)** The combination of **seizures** and **skin macules** (specifically hypopigmented "Ash-leaf" spots) is a classic presentation of Tuberous Sclerosis Complex, a neurocutaneous syndrome inherited in an autosomal dominant fashion (TSC1/TSC2 gene mutations). * **Why it is correct:** In pediatric dermatology, the earliest sign of TSC is often the **Ash-leaf macule** (hypopigmented macules visible under Wood’s lamp). The involvement of the Central Nervous System leads to cortical tubers and subependymal nodules, which manifest clinically as **seizures** and intellectual disability (the "Vogt’s Triad": Seizures, Mental Retardation, and Adenoma Sebaceum). **Analysis of Incorrect Options:** * **A. Sturge-Weber Syndrome:** Characterized by a **Port-wine stain** (Nevus Flammeus) usually in the V1/V2 distribution of the trigeminal nerve. While it causes seizures, the skin lesion is a vascular malformation, not a macule. * **B. Turcot Syndrome:** A variant of Familial Adenomatous Polyposis (FAP) associated with CNS tumors (medulloblastoma/glioma) and colonic polyps. It does not typically present with characteristic skin macules. * **C. Von Hippel-Lindau (VHL) Disease:** Characterized by hemangioblastomas (retina/cerebellum) and renal cell carcinoma. It lacks the specific cutaneous macules associated with seizures in childhood. **High-Yield Clinical Pearls for NEET-PG:** 1. **Skin Findings in TSC:** Ash-leaf spots (earliest), Adenoma Sebaceum (angiofibromas), Shagreen patches (connective tissue nevi), and Periungual fibromas (Koenen tumors). 2. **Diagnostic Triad (Vogt’s):** Epilepsy, Low IQ, and Adenoma Sebaceum (only present in ~30% of cases). 3. **Other Associations:** Cardiac rhabdomyomas (often regress), Renal Angiomyolipomas (AML), and Lymphangioleiomyomatosis (LAM) in the lungs. 4. **Wood’s Lamp:** Essential for identifying Ash-leaf spots in fair-skinned children.
Question 9: In infancy, atopic dermatitis typically spares which of the following areas?
- A. Extensor surfaces
- B. Forehead
- C. Scalp
- D. Diaper area (Correct Answer)
Explanation: **Explanation:** Atopic Dermatitis (AD) is a chronic, pruritic inflammatory skin disease that follows a characteristic age-dependent distribution. In **infancy** (birth to 2 years), the correct answer is the **Diaper area (Option D)**. **Why the Diaper Area is Spared:** The diaper area is typically spared in infantile AD because the high humidity and moisture trapped by the diaper prevent skin dehydration (transepidermal water loss). Since xerosis (dryness) is a primary trigger for AD, the "occlusive" effect of the diaper protects this specific region. If a rash is present in the diaper area, clinicians should consider Seborrheic Dermatitis or Irritant Diaper Dermatitis instead. **Analysis of Incorrect Options:** * **A. Extensor surfaces:** These are the classic sites for AD in infants. As babies begin to crawl, the friction on the knees and elbows triggers the "itch-scratch cycle." * **B. Forehead & C. Scalp:** The face (especially the cheeks and forehead) and the scalp are often the first sites involved in infancy. The lesions are typically acute, presenting as erythematous, edematous, and sometimes weeping plaques. **High-Yield Clinical Pearls for NEET-PG:** * **Evolution of Sites:** * **Infancy:** Face, scalp, and extensors (spares diaper area). * **Childhood/Adulthood:** Flexural surfaces (antecubital and popliteal fossae), neck, and wrists. * **Hertoghe’s Sign:** Thinning of the lateral third of the eyebrows (due to chronic rubbing). * **Dennie-Morgan Fold:** An extra fold of skin under the lower eyelid. * **Filaggrin (FLG) Mutation:** The most common genetic defect associated with skin barrier dysfunction in AD.
Question 10: Ectodermal dysplasia is characterized by which of the following manifestations?
- A. Hypohidrosis
- B. Hypotrichosis
- C. Hypodontia
- D. All of the above (Correct Answer)
Explanation: **Explanation:** **Ectodermal Dysplasia (ED)** refers to a large, heterogeneous group of genetic disorders characterized by the abnormal development of two or more structures derived from the **embryonic ectoderm**. The most common form is **Hypohidrotic Ectodermal Dysplasia (Christ-Siemens-Touraine syndrome)**, typically inherited in an X-linked recessive pattern. The "Classic Triad" of Ectodermal Dysplasia includes: 1. **Hypohidrosis (Option A):** Reduced or absent sweat glands (aplasia/hypoplasia), leading to heat intolerance and life-threatening pyrexia in infancy. 2. **Hypotrichosis (Option B):** Sparse, fine, light-colored scalp and body hair. Eyebrows and eyelashes are often absent or thinned. 3. **Hypodontia/Anodontia (Option C):** Missing teeth or malformed teeth (classically described as **peg-shaped** or conical incisors). Since all three clinical features are hallmark manifestations of the condition, **Option D (All of the above)** is the correct answer. **Clinical Pearls for NEET-PG:** * **Facial Profile:** Patients often exhibit "leonine facies" with frontal bossing, a depressed nasal bridge (saddle nose), and thick, everted lips. * **Skin:** The skin is typically thin, dry (xerosis), and hypopigmented. * **Genetics:** Most cases are due to mutations in the **EDA gene** (encoding Ectodysplasin-A). * **Differential Diagnosis:** Must be distinguished from *Incontinentia Pigmenti*, which also features dental anomalies but presents with distinct linear skin blistering and hyperpigmentation.
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