Metastatic lung cancer involving the vulva: two new cases and literature review.

Two new cases of metastatic lung cancer involving the vulva are presented. Metastasis from primary lung cancer is a rare cause of a vulval tumour and may require special immunohistochemical stains to determine whether the vulval tumour is primary or secondary. Awareness of the possibility of metastatic disease involving the vulva is of importance as the patient's prognosis is dependent on an accurate diagnosis and palliative treatment where appropriate.