Which of the following is the most common cause of nephrotic syndrome in children worldwide?

Question

Accepted Answer

D. Minimal change disease. ## Minimal Change Disease in Nephrotic Syndrome

**Key Point:** Minimal change disease (MCD) is the most common cause of nephrotic syndrome in children, accounting for 85–90% of cases in children aged 2–6 years.

### Epidemiology
- **Peak incidence:** 2–6 years of age
- **Gender:** Slight male predominance
- **Worldwide prevalence:** Most common cause globally in the pediatric population

### Pathological Features
- **Light microscopy:** Glomeruli appear normal (hence "minimal change")
- **Electron microscopy:** Effacement of podocyte foot processes (diagnostic finding)
- **Immunofluorescence:** Negative (no immune deposits) — this is key to distinguishing from other forms

### Clinical Presentation
- Sudden onset of nephrotic syndrome (proteinuria >3.5 g/day, hypoalbuminemia, edema, hyperlipidemia)
- Selective proteinuria (mainly albumin)
- Normal renal function at presentation
- Normal complement levels

### Prognosis
- Excellent response to corticosteroids (90% remission rate)
- Most children achieve complete remission with treatment
- Relapse rate: 30–40% after initial remission

**High-Yield:** In any child presenting with nephrotic syndrome, assume MCD until proven otherwise. The absence of hematuria, normal complement, and excellent steroid responsiveness support this diagnosis.

**Clinical Pearl:** The presence of systemic features (fever, arthralgia, rash) or hematuria should prompt investigation for secondary causes or other glomerular diseases.

Answer

A. Focal segmental glomerulosclerosis

Answer

B. Membranoproliferative glomerulonephritis

Answer

C. Membranous nephropathy

Which of the following is the most common cause of nephrotic syndrome in children worldwide?

Explanation

Minimal Change Disease in Nephrotic Syndrome

Epidemiology

Pathological Features

Clinical Presentation

Prognosis

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