Stage
I The carcinoma is strictly confined to the cervix (extension to the corpus would be disregarded).
IA Invasive carcinoma, which can be diagnosed only by microscopy with deepest invasion ≤5 mm and largest extension ≥7 mm.
IA1 Measured stromal invasion of ≤3.0 mm in depth and extension of ≤7.0 mm.
IA2 Measured stromal invasion of >3.0 mm and not >5.0 mm with an extension of not >7.0 mm.
IB Clinically visible lesions limited to the cervix uteri or preclinical cancers greater than stage IA.b
IB1 Clinically visible lesion ≤4.0 cm in greatest dimension.
IB2 Clinically visible lesion >4.0 cm in greatest dimension.
II Cervical carcinoma invades beyond the uterus but not to the pelvic wall or to the lower third of the vagina.
IIA Without parametrial invasion.
IIA1 Clinically visible lesion ≤4.0 cm in greatest dimension.
IIA2 Clinically visible lesion >4.0 cm in greatest dimension.
IIB With obvious parametrial invasion.
III The tumor extends to the pelvic wall and/or involves lower third of the vagina and/or causes hydronephrosis or nonfunctioning kidney.c
IIIA Tumor involves lower third of the vagina with no extension to the pelvic wall.
IIIB Extension to the pelvic wall and/or hydronephrosis or nonfunctioning kidney.
IV The carcinoma has extended beyond the true pelvis or has involved (biopsy proven) the mucosa of the bladder or rectum. A bullous edema, as such, does not permit a case to be allotted to stage IV.
IVA Spread of the growth to adjacent organs.
IVB Spread to distant organs.