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Pediatric Puzzler

Suspicious fever of unknown originA 5-month-old Hispanic boy, previously healthy, presents to the emergency department (ED) for 5 days of fever, 3 days of diarrhea and rash, and 2 days of vomiting. He had been diagnosed with acute otitis media by his primary care physician 3 days prior to his presentation and started on amoxicillin. The parents brought their son to the ED because of his persistent fever up to 104°F and decreased oral intake. He has no recent travel and no known sick contacts. His immunizations are up to date and he has never been hospitalized. He was born in the United States, full term with an uncomplicated birth history.
Can you solve these 6 puzzling cases?We know you love a diagnostic challenge. Can you crack these 6 puzzling cases?
Child’s ear pain progresses to leg pain, arm pain, and feverAn 8-year-old girl is admitted to the hospital with complaints of right ear pain, right leg pain, left arm pain, and fever after a week of worsening symptoms.
Infant girl develops bulging sacral massA 3-week-old female presented to the emergency department with a 3-day history of a progressively enlarging, erythematous, seemingly painful lump on her back.