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Journal of Ultrasound in Medicine, Vol 10, Issue 10 579-581, Copyright © 1991 by American Institute of Ultrasound in Medicine

JOURNAL ARTICLE

The fetal presacral pseudo-mass: a normal sonographic variant

T. J. Karcnik, J. B. Rubenstein and L. C. Swayne
Department of Radiology, Morristown Memorial Hospital, New Jersey 07960.

We examined 416 consecutive third trimester intrauterine gestations over a 4-month period and discovered 26 hypoechoic masses in the fetal presacral space (6.3% incidence). These masses varied in diameter from 15 to 30 mm (mean, 21.5 mm). All neonates were normal on follow-up examination, without evidence of any masses or neurologic deficits. The fetal rectosigmoid colon frequently is identified in the third trimester and may reach 2 to 3 cm at term. Because the prevalence of meconium-filled rectum (6.3%) exceeds that of a presacral teratoma (0.0025%), this normal anatomic variant should be considered the most common cause of a third trimester presacral "mass."




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Copyright © 1991 by the American Institute of Ultrasound in Medicine.