A rare case of a pregnancy of a 34-year old IV gravida/II para is reported,
which ended in the 19(th) week with the rupture of a rudimentary horn of t
he uterus bicornis unicollis. Histopathological examination showed a placen
ta accreta. Two years after this event spontaneous birth of a boy resulted
without any pathological findings of the placenta. Basing on the literature
, the significant roles played by ultrasonic investigation as well as by se
rum-AFP-screening are pointed out.