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Cervical dysplasia CIN 1. Colposcopy of a cervix (centre) with CIN 1 dysplasia. This is the first stage in the possible development of cervical cancer. The affected precancerous area is slightly puffy with a discoloured area around the os (cervical opening) at centre. The speculum (silver) is at the periphery, holding back the vaginal walls. Dysplasia occurs when cell division of the stratified squamous epithelium of the cervix is disrupted and abnormal cell growth occurs. There are 3 stages of cervical dysplasia: mild (CIN 1), moderate (CIN 2) and severe (CIN 3) with early cancer. Treatment may involve surgery to remove affected tissue.
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