Adnexal torsion is rare before menarche. We report the case of a 10-year-ol
d girl with persistent left lower quadrant pain proven by surgery to be cau
sed by adnexal torsion due to a hemorrhagic cyst. Sonography showed a well-
defined, complex, predominantly solid mass with some sound through-transmis
sion and a small amount of fluid. The left ovary could not be distinguished
from the mass; the right ovary appeared normal. Doppler sonography demonst
rated no blood flow within the mass. MRI revealed a circumferential region
of high signal intensity in the periphery of the mass and multiple hyperint
ense foci in the left ovary. (C) 2001 John Wiley & Sons, Inc.