Group of disorders which are associated with pregnancy and arise from abnormal growth of placental trophoblast.

They occur in women in reproductive age.

The common feature of these disorders is that they produce hCG (chorionic gonadotropin), which is a useful marker for diagnostics, evaluation of the clinical course and response to therapy.

Both benign nonneoplastic disorders (hydatidiform mole) and malignant aggresive neoplasms (choriocarcinoma) are included.