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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 5 year old child presents with perivascular IgA deposition and neutrophilic collection. There is erythematous rash on the lower limbs and non - blanching purpura. The likely diagnosis in the child is
assistant
The correct answer is  Henoch schonlein purpura

It is a common vasculitis in children
This is a vasculitis with IgA deposits affecting small vesseles like arterioles, capillaries and venules of the skin, gut and glomeruli and commonly associated with arthralgia.
Clinical features include palpable purpura (due to vasculitis and not reduced platelet count), colicky abdominal pain, arthalgia in multiple Joints and glomerulonephritis.
It is caused due to immune complex deposition but complement levels are usually normal.