NCIt definition : Stage IIIB includes: T1-T2, N2a, N2b, M0. T1: Tumor confined to the vulva and/or perineum.
Multifocal lesions should be designated as such. The largest lesion or the lesion
with the greatest depth of invasion will be the target lesion identified to address
the highest pT stage. Depth of invasion is defined as the measurement of the tumor
from the epithelial-stromal junction of the adjacent most superficial dermal papilla
to the deepest point of invasion. T2: Tumor of any size with extension to adjacent
perineal structures (lower/distal third of the urethra, lower/distal third of the
vagina, anal involvement). N2a: Three or more lymph node metastases each less than
5 mm. It includes micrometastasis, N2mi. N2b: Two or more lymph node metastases equal
to 5 mm. M0: No distant metastasis. (AJCC 8th Ed.);