2023 Volume 59 Issue 3 Pages 304-310
We retrospectively investigated newborns and infants who were treated at our hospital under the diagnosis of ovarian cyst. We divided them into two groups, a spontaneous regression group and a surgery group, and examined the details. We excluded fetal treatment cases. The maximum size of the ovarian cyst at fetal period was 3.3±1.1 cm in the spontaneous regression group and 5.0±1.3 cm in the surgery group and at birth was 1.6± 1.2 cm and 5.2 ± 1.6 cm, in both cases, which was significantly larger in the surgery group（p <0.01）. The rate of change in cyst diameter from the time when the cyst diameter was the largest to after birth was -42±36％ in the spontaneous regression group and + 5.1±27％ in the surgery group, and the spontaneous regression group tended to decrease significantly（p <0.01）. The number of weeks of gestation at the time of the largest fetal cyst diameter was 32±3.2 weeks in the spontaneous regression group and 37 ± 2.1 weeks in the surgery group, which was significantly earlier in the spontaneous regression group（p<0.01）. Similar results were confirmed when comparing cases that had twisted at the time of surgery. From these results, in addition to the cyst diameter itself, the cases which the cyst diameter peaks in the fetal period after 38 weeks and in cases which the rate of change until birth is greater than -5％, it should be considered that the cyst has already torsioned or is likely to torsion.
