Amyloid A amyloidosis: frequently neglected renal disease in injecting drug users.

Implication for health policy/practice/research/medical education: Amyloid A (AA) amyloidosis is a systemic form of amyloidosis secondary to chronic infections and inflammatory disorders such as recurrent suppurative skin infections secondaryto subcutaneous administration of drugs (skinpopping).The diagnosis of AA amyloidosis is frequently overlooked due to the insidious nature of the disease. The renal manifestations of AA amyloidosis include proteinuria, tubular dysfunction, and progressive loss of renal function. Urinalysis and quantification of urinary protein excretion are important screening tests. Early diagnosis and treatment of AA amyloidosis can reverse end-organ damage.