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Review Question - QID 107820

In scope icon M 6 D
QID 107820 (Type "107820" in App Search)
A 7-year-old child with a history of abdominal and thigh pain that runs in his family is brought into the emergency room by his mother. His mother states they have a "blood disease." She also states the child was coughing and had fever to 101.1 F over the last three days and has been suddenly feeling much worse. On exam, the vitals are HR 110, BP 100/60, RR 20, T 101.5 F. CBC is significant for Hgb 3.2, WBC 2.1, Hct 10, Plts 30000. The reticulocyte count is 1% and the MCV is 81. Bone marrow biopsy shows hypocellular marrow with fatty tissue. What is the most likely diagnosis?