The aim of the study was to gain a theoretical understanding of parents' experiences and handling of the situation, when their foetus was diagnosed as having choroid plexus cysts, at a routine second trimester ultrasound examination. Nine couples and one mother were interviewed using one open question. Analysis method was Grounded Theory. The main concern was anxiety and the core category became need for knowledge. The other categories were frightening and confusing, judging risk and making a choice and comforting. The parents felt information during the ultrasound examination was insufficient. The time delay between the diagnosis and the doctor's appointment was also often criticized. Most of the parents in this study wanted to know what can be diagnosed by ultrasound, even if there is a small risk that the child will have a malformation or chromosome abnormality. However, when the diagnosis is made, they need adequate information, otherwise unnecessary anxiety arises. By giving sufficient information without days of delay, anxiety can hopefully be minimized. Some written information was also requested. It is of utmost importance that the staff use the same terminology and the correct name of the soft marker to the parents.