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A 4 year old is brought to doctor with purplish patches on his arms and thorax. Mother says boy has history of recurrent pneumococcal pneumonia and red itch rashes on inside of his elbows and knees that leak fluid and crust over when scratched. Labs show thrombocytopenia nad selective decrease in IGM. 1. What is your diagnosis? Why?

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The General Principles section of the USMLE covers these topics:
Biochemistry
Genetics
Microbiology
Pathology
Pharmacology


1. A 4 year old is brought to doctor with purplish patches on his arms and thorax. Mother says boy has history of recurrent pneumococcal pneumonia and red itch rashes on inside of his elbows and knees that leak fluid and crust over when scratched. Labs show thrombocytopenia nad selective decrease in IGM. 1. What is your diagnosis? Why?





 
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