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We investigated the natural history of fetal ovarian cysts to estimate the risk of torsion according to size.

Cases were identified from 1/1/2000 until 1/1/2015. Data were collected pre- and postnatally on cyst size and sonographic features until an outcome of surgery, torsion, or resolution. Fisher's exact test for categorical data and logistic regression for continuous data were used to test the significance of size on torsion; P value < 0.05 was considered significant.

37 patients with unilateral ovarian cysts were included. 12 (32%) resolved spontaneously prenatally, 14 (38%) resolved spontaneously postnatally, 5 (14%) underwent surgery postnatally and 6 (16%) cases underwent torsion. Rate of torsion increased with size from 0% (n = 0) in cysts ≤ 20 mm to 33% (n = 2) in cysts > 50 mm; however, the overall trend failed to reach statistical significance (P = 0.1). Cysts of 0–40 mm had a significantly …