From: Cervical Cancer Treatment (PDQ®)
PDQ Cancer Information Summaries [Internet].
Bethesda (MD): National Cancer Institute (US); 2002-.
NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.
Table 1. Definitions of FIGO Stage Ia
| Stage | Description |
|---|---|
| I | The carcinoma is strictly confined to the cervix (extension to the corpus should be disregarded). |
| IA | Invasive carcinoma that can be diagnosed only by microscopy, with maximum depth of invasion ≤5 mm.b |
| –IA1 | –Measured stromal invasion ≤3 mm in depth. |
| –IA2 | –Measured stromal invasion >3 mm and ≤5 mm in depth. |
| IB | Invasive carcinoma with measured deepest invasion >5 mm (greater than stage IA); lesion limited to the cervix uteri with size measured by maximum tumor diameter.c |
| –IB1 | –Invasive carcinoma >5 mm depth of stromal invasion and ≤2 cm in greatest dimension. |
| –IB2 | –Invasive carcinoma >2 cm and ≤4 cm in greatest dimension. |
| –IB3 | –Invasive carcinoma >4 cm in greatest dimension. |
FIGO = Fédération Internationale de Gynécologie et d’Obstétrique.
aAdapted from FIGO Committee for Gynecologic Oncology.[3]
bImaging and pathology can be used, when available, to supplement clinical findings with respect to tumor size and extent, in all stages. Pathological findings supersede imaging and clinical findings.
cThe involvement of vascular/lymphatic spaces should not change the staging. The lateral extent of the lesion is no longer considered.