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Case Reports
. 2005 Feb;15(2):263-6.
doi: 10.1007/s00330-004-2330-4. Epub 2004 Apr 23.

CT and MR findings of a retrorectal cystic hamartoma confused with an adnexal mass on ultrasound

L Menassa-Moussa  1 , H Kanso, A Checrallah, J Abboud, M Ghossain
Affiliations
Case Reports

CT and MR findings of a retrorectal cystic hamartoma confused with an adnexal mass on ultrasound

L Menassa-Moussa et al. Eur Radiol. 2005 Feb.

Abstract

We describe the imaging features of a tailgut cyst mistaken for an adnexal mass. A pelvic ultrasound in a 28-year-old woman showed a 10-cm hypoechoic left pelvic mass. Having not seen the left ovary, the radiologist concluded that the mass was an endometrioma. CT disclosed a retrorectal cystic lesion with wall calcifications and internal septa. MR confirmed the extra-ovarian location of the tumor, which was hyperintense on T2-weighted images and had an intermediate signal on T1-weighted images. Surgery revealed a retrorectal cystic hamartoma. Radiological diagnosis of a tailgut cyst requires first correct localization of the tumor and then differentiation from other retrorectal masses.

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