Delayed regression of huge theca lutein cysts monitored by serial sonograms and beta-HCG levels.

The important role of serum beta-human chorionic gonadotropin (beta-HCG) in detecting spread of trophoblastic disease following evacuation of a hydatidiform mole is well established (1,2). Although sonography is accepted as the primary imaging technique in the diagnosis of hydatidiform mole (3), only a few authors have described the post-evacuation appearances of the pelvis, in particular the regression of theca lutein cysts (4,5). We here report a patient in whom there was delayed regression of huge theca lutein cysts compared to the regression of the serum beta-HCG levels after evacuation of a benign non-recurring hydatidiform mole.