There are abnormal cells seen in this cervical biospy extending from the basement membrane right out to the surface. This qualifies as a CIN stage 3. It is difficult to distinguish CIN 3 from carcinoma in situ but you won't be asked to do that.
Note CIN 1 - abnormal cells in inner third only
CIN 2 - abnormal cells in inner and middle third of cervical epithelium
Also note basememt membrane is intact - no abnormal cells beneath the basement membrane therefore (in this section at least) there is no evidence of invasion. |
