Pelvic kidney masquerading as an adnexal mass.

A case of a pelvic kidney diagnosed as an adnexal mass, resulting in surgery, is reported. The employment of ultrasonography in the evaluation of suspected pelvic masses is well established. A number of pathologic conditions can be responsible for a pelvic mass in female patients and consideration of the differential diagnosis of such masses has been well documented. The discrimination of a pathologic pelvic mass from an anatomic variation or unusual location of a normal structure can be, however, a potential source of confusion and erroneous interpretation. This report concerns the unfortunate result of not considering a renal anomaly, i.e. ectopic pelvic kidney, in the differential consideration of a "pelvic mass".