A Study of Fluorescein Sodium in People Undergoing Vulvectomy for Extramammary Paget's Disease (EMPD)

Inclusion Criteria: * Age ≥18 years * Noninvasive or microinvasive EMPD with a contiguous visible clinical lesion * Newly diagnosed or recurrent lesion * Scheduled to undergo wide local excision or vulvectomy not requiring resection of the clitoris, urethra, or anus and with the surgeon's judgment that primary closure is possible (V-Y advancement flap closure is allowed) Exclusion Criteria: * History of allergic reaction to fluorescein sodium * Multifocal, noncontiguous clinical lesion * Current or previous invasive EMPD * History of invasive vulvar, vaginal, or anal cancer * Lesion in which resection of the clitoris, urethra, and/or anus is deemed to be necessary * Lesion in which a primary closure or V-Y advancement flap is believed not to be possible and a larger myocutaneous flap is needed for closure of the defect * History of radiation therapy to the vulva and/or anus