Conversion of a complete hydatidiform mole into choriocarcinoma is indicated by all, EXCEPT:
Plateau HCG levels
Enlarged Uterine size
Persistence of theca Lutein cysts
Suburethral Nodule
Suburethral Nodule is an unusual indicator of postmolar choriocarcinoma. All others are very well seen in the conversion of a complete hydatidiform mole into choriocarcinoma. Suburethral nodule may be a manifestation of vaginal metastasis from choriocarcinoma. Metastatic choriocarcinoma is however seen in only about 4% of patients after evacuation of a complete mole and vaginal metastasis that may present with suburethral nodule occur in only 30% of patients with such metastatic disease. Hence it is an unusual indicator. Ref: Novok's, 14th Edition, Page 1588, 1591, 1592 ; William's Gynaecology, 1st Edition, Page 764 ; COGDT, 10th Edition, Page 1890 ; Gynecological Cancer Management : Identification, Diagnosis and Treatment By Daniel Clarke-Pearson, John Soper, 2011.