[A rare case of pregnancy combined with a large ovarian tumour].

Aim: Our aim was to demonstrate the diagnostic difficulties as well as the atypical clinical development of ovarian tumours in combination with pregnancy.

Material And Methods: We present a rare case of large mucinous cystadenoma in 32-year old patient, who is 20 gestational weeks pregnant. Ultrasound examination and MRI were performed, which visualized a huge multilocular ovarian tumour formation with a small amount of ascites.