Type 1: Squamocolumnar junction completely visible
Type 2: Squamocolumnar junction partly visible
Type 3: Squamocolumnar junction not visible
There are 3 types of T-Zone.
The squamocolumnar junction (SCJ) is the area where cervical neoplasia originates and is located. The squamocolumnar junction must be visible in order to make a safe colposcopic assessment. Therefore, the classification of the transformation zone (T-zone) according to the visibility of the SCJ is important. Colposcopic examination is only valid in the presence of a transformation zone type 1 or type 2.