Antenatal torsion of the uterine adnexa in a neonate.

An antenatal detection of unilateral torsion of uterine adnexa was made by means of ultrasonography on the 32nd gestational week. This presented as an asymptomatic large "pseudo-cystic" mass, and was resected electively at the age of two weeks. A "fluid-fluid" level on ultrasonography is highly suggestive of this rare entity. This is the fourth case in the English literature to have been detected antenatally, and among the first dozen to be reported in the neonatal period.