A 3-year-old child was brought to the hospital with complaints of fever, rash and swelling of her hands and feet since past 5 days. There is desquamative skin rash, oedema of hands and feet, erythema of palms and soles, oral erythema, and cervical lymphadenopathy. What is the likely condition?

Correct Answer: A. Kawasaki disease

Kawasaki disease (mucocutaneous lymph node syndrome) is an acute, self-limited vasculitis of medium-sized arteries, predominantly affecting children <5 years. The clinical presentation here is pathognomonic: fever lasting >5 days (mandatory criterion), desquamative rash (typically maculopapular, non-pruritic, appearing on trunk and extremities), edema of hands and feet, erythema of palms and soles, oral erythema (strawberry tongue, lip cracking), and cervical lymphadenopathy (usually unilateral, >1.5 cm). The diagnosis requires fever ≥5 days PLUS ≥4 of 5 principal features: bilateral non-exudative conjunctivitis, oral changes, rash, extremity changes (edema/erythema/desquamation), and cervical lymphadenopathy. This child meets all criteria. The critical pathology is coronary artery vasculitis leading to coronary artery aneurysms in 25% of untreated cases—the leading cause of acquired heart disease in children in developed nations and increasingly in India. Early recognition and IVIG + high-dose aspirin therapy within 10 days of fever onset reduces coronary complications from 25% to <5%. The desquamative rash and extremity edema with erythema of palms/soles are highly discriminating features that distinguish Kawasaki from other childhood vasculitides.

Why the other options are wrong

B. Measles — Measles presents with cough, coryza, conjunctivitis (the 3 Cs), and Koplik spots (pathognomonic white spots on buccal mucosa appearing before rash). The rash is maculopapular but appears on face first and spreads downward, NOT with the characteristic desquamation and extremity edema seen in Kawasaki. Fever typically resolves as rash appears. Cervical lymphadenopathy is not a prominent feature. The absence of cough/coryza and the specific pattern of extremity involvement rule this out. C. Henoch Schonlein Purpura — HSP is a small-vessel IgA vasculitis presenting with palpable purpura (typically lower extremities and buttocks), arthritis/arthralgia, abdominal pain, and renal involvement. The rash is purpuric, NOT desquamative erythema. While HSP can have edema, it lacks the characteristic oral erythema, strawberry tongue, and bilateral conjunctivitis of Kawasaki. Fever is usually absent or mild and brief. The clinical pattern and rash morphology are distinctly different. D. Scarlet fever — Scarlet fever (Group A Streptococcus toxin-mediated illness) presents with sandpaper-like rash, strawberry tongue, and pastia lines (accentuation in skin folds). However, it is preceded by pharyngitis with sore throat and exudative pharyngitis—cardinal features absent here. The rash appears within 1–2 days of fever onset, not after 5 days. Desquamation occurs in the 2nd–3rd week post-rash. The absence of pharyngitis and the timing of rash appearance distinguish this from Kawasaki.

High-Yield Facts

Mnemonics

CRASH-C for Kawasaki Diagnosis Conjunctivitis (bilateral, non-exudative) | Rash (maculopapular, non-pruritic) | Aral changes (strawberry tongue, lip erythema) | Swelling of extremities (edema, erythema of palms/soles) | High fever (≥5 days) | Cervical lymphadenopathy (unilateral, >1.5 cm). Requires fever + ≥4 features. CAA Rule: Coronary Artery Aneurysm Children <5 years | Acute vasculitis of medium arteries | Aneurysm risk 25% untreated. Remember: Early IVIG + aspirin = <5% risk. This is why Kawasaki is a medical emergency in pediatrics.

NBE Trap

NBE may pair Scarlet fever with strawberry tongue to lure students into choosing it; however, Scarlet fever requires preceding pharyngitis and exudative throat findings, which are absent here. The 5-day fever duration and desquamative extremity rash are Kawasaki-specific discriminators.

Clinical Pearl

In Indian pediatric practice, Kawasaki disease is often initially missed as a "viral fever with rash," delaying IVIG therapy beyond the critical 10-day window. The combination of prolonged fever (>5 days) + desquamative rash + extremity edema should immediately trigger Kawasaki workup (echocardiography for coronary assessment) and empiric IVIG + aspirin initiation, even before confirmatory tests, to prevent lifelong coronary artery disease.

_Reference: Robbins & Cotran Pathologic Basis of Disease, Ch. 11 (Blood Vessels); Harrison's Principles of Internal Medicine, Ch. 356 (Vasculitis); OP Ghai Pediatrics, Ch. 10 (Cardiovascular Diseases)_