[Endometriosis of the vulva].

The greater labium is an uncommon site for endometriosis. Cases have been described by Palmer (I925), Henry (i927) and others. The lesion usually consists of a small red nodule painful during menstruation, slowly enlarging and consisting histologically of small blood filled cysts lined by columnar epithelium, in places forming typical endometrial glandular structures; the stroma consisting of fibrous tissue with some plasma cells and endothelial leucocytes containing haemosiderin. In some instances the histological picture has corresponded to that seen in the endometrium at the same phase of the menstrual cycle, as in Henry's case in which the tumour was removed two days before the onset of menstruation. The following case is interesting for its short history and the great size of the tumour.