Metastatic endometriosis in abdominal scars.

The author presents two examples of metastatic endometriosis occurring in an abdominal scar. These case reports illustrate the two main theories of the pathogenesis of the condition: transportation and metaplasia. The diagnosis is straightforward in the classic case in which a painful mass fluctuates with the menstrual cycle, but a biopsy may be needed to confirm the diagnosis when the history is atypical. The treatment of choice, for those who require treatment, may be hormonal manipulation, surgery or irradiation, or a combination of these.