A 10-month-old girl born in Delhi presents with her parents with a 2-month history of poor feeding, constipation, and irritability. Physical examination reveals bleeding gums, perifollicular hemorrhages on the lower extremities, and poor wound healing from a recent vaccination site. Hemoglobin is 9.2 g/dL with microcytic indices. Serum vitamin C level is 0.2 mg/dL (normal >0.6 mg/dL). X-ray of the knee shows a characteristic 'scorbutic rosary' with a dense metaphyseal line. What is the most appropriate next step in management?

Explanation

## Clinical Diagnosis & Management: Vitamin C Deficiency (Scurvy) in Infants ### Presentation & Epidemiology **Key Point:** Vitamin C deficiency (scurvy) in infants typically occurs in 6–24 months of age when exclusive feeding is with boiled/pasteurized milk (which destroys vitamin C) without introduction of fresh fruits or vegetables. This 10-month-old from Delhi presents with the classic pentad of infantile scurvy: 1. **Hemorrhagic manifestations:** Bleeding gums, perifollicular hemorrhages, poor wound healing 2. **Gastrointestinal symptoms:** Poor feeding, constipation (due to abdominal pain from bleeding) 3. **Hematologic finding:** Microcytic anemia (secondary to chronic blood loss and iron malabsorption) 4. **Biochemical confirmation:** Serum vitamin C 0.2 mg/dL (deficiency <0.2 mg/dL) 5. **Radiological sign:** Scorbutic rosary (dense metaphyseal line with surrounding lucency—Wimberger's ring) ### Pathophysiology of Vitamin C Deficiency ```mermaid flowchart TD A[Vitamin C Deficiency]:::outcome --> B[↓ Collagen synthesis]:::outcome B --> C[Defective osteoid formation]:::outcome C --> D[Impaired fracture healing]:::outcome B --> E[Fragile blood vessels]:::outcome E --> F[Hemorrhage into tissues]:::urgent F --> G[Perifollicular hemorrhages]:::outcome F --> H[Bleeding gums]:::outcome F --> I[Subperiosteal hemorrhages]:::outcome I --> J[Scorbutic rosary on X-ray]:::outcome B --> K[↓ Iron absorption]:::outcome K --> L[Microcytic anemia]:::outcome ``` ### Biochemical & Radiological Features | Feature | Vitamin C Deficiency | Vitamin D Deficiency | Iron Deficiency | |---------|----------------------|----------------------|-----------------| | **Serum Vitamin C** | **↓↓ (<0.2 mg/dL)** | Normal | Normal | | **Bleeding manifestations** | **Yes (hemorrhages)** | No | No | | **Gum bleeding** | **Yes** | No | No | | **X-ray finding** | **Scorbutic rosary** | Metaphyseal widening | Normal | | **Calcium/Phosphate** | Normal | Abnormal | Normal | | **Alkaline phosphatase** | Normal | Elevated | Normal | **High-Yield:** The **scorbutic rosary** is a dense metaphyseal line (Wimberger's ring) with a surrounding lucent zone—distinct from the metaphyseal widening of rickets. ### Management Protocol **Key Point:** Vitamin C supplementation produces rapid clinical improvement; bleeding stops within 24–48 hours, and radiological changes resolve within 2–3 weeks. #### Dosing Regimen (WHO & IAP Guidelines) 1. **Loading phase:** 200 mg daily for 2 weeks 2. **Maintenance phase:** 50 mg daily for 1–2 months 3. **Prophylaxis:** 10–25 mg daily (in high-risk populations) #### Supportive Measures - **Dietary modification:** Introduction of fresh fruits (citrus, guava, papaya, berries) and vegetables (tomatoes, leafy greens) - **Iron supplementation:** If hemoglobin <8 g/dL (as in this case with Hb 9.2 g/dL, iron supplementation may be considered after vitamin C repletion improves absorption) - **Avoid:** Boiled/pasteurized milk as sole food source; introduce complementary feeding at 6 months **Clinical Pearl:** Vitamin C acts as a reducing agent and enhances non-heme iron absorption; therefore, vitamin C repletion will improve the microcytic anemia even without direct iron supplementation in many cases. ### Why This Case Is Vitamin C Deficiency (Not Iron Deficiency Anemia) - **Bleeding gums and perifollicular hemorrhages** are pathognomonic for scurvy—not seen in pure iron deficiency - **Poor wound healing** (vaccination site) reflects collagen synthesis defect - **Serum vitamin C 0.2 mg/dL** confirms the diagnosis - **Scorbutic rosary on X-ray** is diagnostic **Mnemonic:** **SCURVY** = **S**erum vitamin C low, **C**ollagen defective, **U**nhealed wounds, **R**ed gums, **V**essels fragile, **Y**ellow-orange foods lacking [cite:Park 26e Ch 9; Ghai Essential Pediatrics 10e Ch 4]