A 6-year-old boy known to have Sickle Cell Anemia (HbSS) is admitted to the pediatric inpatient ward with fever (38.9°C), productive cough, tachypnea, and chest wall pain. Physical examination reveals bronchial breathing over the right middle lobe, and pulse oximetry is 89% on room air. Chest radiograph demonstrates a new consolidation in the right middle lobe. What is the definitive clinical diagnosis?

Answer and explanation

Correct answer: B. Acute Chest Syndrome

  1. Step 1: Acute Chest Syndrome (ACS) is defined in sickle cell patients as the presence of a new pulmonary infiltrate on chest radiography accompanied by fever, respiratory distress (tachypnea, hypoxia, wheezing, cough), or chest pain.
  2. Step 2: ACS is a leading cause of mortality in sickle cell disease and requires prompt treatment with supplemental oxygen, empiric broad-spectrum antibiotics (covering S. pneumoniae and atypicals like Mycoplasma), cautious hydration, analgesia, and simple or exchange blood transfusion for progressive hypoxemia.
  3. Step 3: Aplastic crisis manifests as reticulocytopenia from Parvovirus B19 without new lung consolidations.
Answer
Acute Chest Syndrome.
Why not the others: 'Aplastic Crisis' produces sudden severe anemia with reticulocyte count < 1% due to Parvovirus B19; 'Splenic Sequestration Crisis' presents with sudden massive splenomegaly and circulatory collapse; 'Isolated rib infarction' causes chest wall tenderness but does not produce new pulmonary infiltrates on chest X-ray.

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