Patient History: A premature twin boy was born at 25.6 weeks who had been receiving inpatient treatment in NICU since birth for respiratory distress syndrome. At 2 months of age postpartum, the patient was given his first dose of the routine infant vaccinations, a 0.5 mL dose of (DTaP/HepB/Ipv). The following day, the patient developed pain in his right leg that appeared to worsen with extension. Physical Examination: Examination revealed a body weight of 2.012 kg (birth weight = 0.921 kg), mild effusion of the right knee, and resistance to passive flexion and extension of the right knee.
Vital signs remained stable and afebrile. No central venous lines were noted on exam. Laboratory Findings: Data showed a white blood count of 18000 cells/mL with 48% neutrophils, hemoglobin of 13.8 g/dL, C-reactive protein of 224 mg/L, and erythrocyte sedimentation rate 47. Radiologic Findings :…
