A 3-year-old girl presented with a 1-week history of abdominal pain and a rash. Her mother says that the rash developed following recovery from an upper respiratory tract infection and that she has also been complaining of knee pain. On examination, a purpuric rash is seen on her legs and feet. Urinalysis reveals hematuria and proteinuria.

What can be the underlying disorder? *This case is from Docplexus Editorial Team for educative purpose only Source: Clinical Advisor The answer is posted in the comment section. Click here .