Imaging in vulval cancer.

Cancer of the vulva spreads locally and, almost without exception, to the regional nodes in the groin to the superficial then deep inguinal groups and the pelvic nodes in a step-wise fashion. Because the single most important prognostic factor is the presence or absence of nodal disease, accurate diagnosis of nodal involvement is paramount. In the past, the status of inguinal nodes in vulval cancer has been ascertained only following groin node dissection, except in those cases with clinically obviously groin nodes. However, as up to 70% of patients at all stages of disease have negative nodes histologically, and as up to 70% of patients have groin or lower-limb problems after radical groin surgery, this approach incurs 'unnecessary' surgery for the majority of patients with the attendant morbidity. Using new diagnostic imaging methods, detection and assessment of groin lymph nodes has been developing over the past few years with the ultimate intention of reducing groin node surgery in node-negative patients. In this chapter we review the role of imaging in patients with vulval cancer in which there is a greater role in the assessment of nodal disease rather than in the assessment of the cancer on the vulva.