Inclusion Criteria:

- Female patients 18-100 years of age.

- All races and ethnicities.

- Being seen in the Winthrop P. Rockefeller Cancer Institute for vulvar cancer
requiring lymph node evaluation for the ipsilateral or contralateral groin.

- Willing participation following informed consent process.

Exclusion Criteria:

- Has not had prior groin surgery or radiation to the groins.

- Any condition the PI or study physician determines that will put the subject at risk
during the procedure.

- Allergy to blue dye used in lymphatic identification.

- Pregnant or breast feeding.