Anal dysplasia is a pre-cancerous condition which occurs when the mucosa lining of the anal canal undergo abnormal changes. During this condition, lesions or visible pattern of clustered abnormal cells appear. These cells may then progress from low-grade lesions to high-grade lesions.
High Resolution Anoscopy, or HRA, is a procedure that allows for examination and evaluation of the anal canal. Using a small thin round tube called an anoscope, the anal canal is examined with a high resolution magnifying instrument called a colposcope.