The clinical utility of abdominopelvic immunoscintigraphy (IS) using anti-beta HCG-labelled monoclonal antibodies was evaluated in six patients with resistant gestational trophoblastic disease and no common pathological site. Five patients with abnormal retrovesical uptake had persistence of uterine trophoblastic disease confirmed on hysterectomy. Four of these patients are now in remission. It is concluded that IS provides a useful indication for surgery when a single abnormal uptake site is found.
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