Purpose of colposcopy
1 : Identify and remove cervical precancerous lesions to prevent their progression to cancer;
2 : Select abnormal lesions, locate biopsy, and increase the negative rate of biopsy;
3 : Determine the extent of abnormal lesions, especially the extent of cervical lesions;
4 : Determine normal and abnormal scale junctions and transfer belts;
5 : Eliminate invasive cancer.
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