Anatomic sites and subsites of the vulva. Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer

Regional lymph nodes of the vulva. Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer

Vulva T1a is defined as lesions 2 cm or less in size, confined to the vulva or perineum and with stromal invasion 1.0 mm or less. Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer

Vulva “(A) T1a is defined as lesions 2 cm or less in size, confined to the vulva or perineum and with stromal invasion 1.0 mm or less. (B) T1b is defined as lesions more than 2 cm in size or any size with stromal invasion more than 1.0 mm, confined to the vulva or perineum Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer

Vulva T1b is defined as lesions more than 2 cm in size or any size with stromal invasion more than 1.0 mm, confined to the vulva or perineum Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer

Vulva T2 is defined as tumor of any size with extension to adjacent perineal structures (lower/distal third of urethra, lower/distal third of vagina, anal involvement). Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer

Vulva Cross-sectional diagram showing spread of tumor into anus, lower vagina, and lower urethra. T2 is defined as tumor of any size with extension to adjacent perineal structures (lower/distal third of urethra, lower/distal third of vagina, anal involvement). Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer

Vulva T3 is defined as tumor of any size with extension to any of the following: upper/promixal two-thirds of urethra, upper/proximal two-thirds of vagina, bladder mucosa, rectal mucosa, or fixed to pelvic bone. Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer

Vulva N1a is defined as one or two lymph nodes metastasis each less than 5 mm. Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer

N1b is defined as one lymph node metastasis 5 mm or greater. Vulva N1b is defined as one lymph node metastasis 5 mm or greater. Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer

Vulva N2a is defined as three or more lymph node metastases each less than 5 mm. Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer

N2b is defined as two or more lymph node metastases 5 mm or greater. Vulva N2b is defined as two or more lymph node metastases 5 mm or greater. Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer

N2c is defined as lymph node metastasis with extracapsular sprea. Vulva N2c is defined as lymph node metastasis with extracapsular sprea. Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer

N3 is defined as fixed or ulcerated regional lymph node metastasis. Vulva N3 is defined as fixed or ulcerated regional lymph node metastasis. Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer

These nodal metastases are considered M1. Vulva These nodal metastases are considered M1. Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer