We present a rare case of a hydatidiform mole that occurred in a 56-ye
ar old woman. The main symptom was prolonged vaginal bleeding, and the
gynaecological examination revealed a markedly enlarged uterus. Sonog
raphy revealed a 9 x 15 cm large cystic tumour in the pelvis. At opera
tion, a suspicion of trophoblastic disease was arosen. Serum human cho
rion gonadotropin was still markedly elevated on the fifth postoperati
ve day. After removal of the uterus and adnexae the recovery and the 3
-year follow-up have been uneventful.