title: "Ovarian vascular pedicle" sign revealing organ of origin of a pelvic mass lesion on helical CT.
abstract: OBJECTIVE
  We evaluated the "ovarian vascular pedicle" sign as a way of differentiating ovarian from subserosal uterine lesions on single-detector helical CT.
  
  
  METHODS
  We prospectively evaluated 131 patients who had a pelvic mass suspected of originating in the ovary or subserosal zone of the uterus and had undergone helical CT before surgery. A total of 108 ovarian lesions and 23 subserosal uterine myomas were confirmed. CT images were analyzed prospectively by consensus of two radiologists who thoroughly evaluated the retrograde tracing of the gonadal veins to the ovary or pelvic mass. To assess the value of analyzing the ovarian vascular pedicle sign in identifying the organ of origin of a pelvic mass, we compared statistical proportions for the frequencies of the sign in ovarian tumors and subserosal uterine myomas by performing the chi-square test. The probabilities for the presence of the ovarian vascular pedicle sign as a positive finding for a pelvic mass of ovarian origin were calculated.
  
  
  RESULTS
  The presence of the ovarian vascular pedicle sign was identified in 92% (99/108) of ovarian masses and in 13% (3/23) of subserosal uterine myomas. The sign was statistically significant (p < 0.01) for differentiating a mass of ovarian origin from a mass of subserosal uterine origin. When the ovarian vascular pedicle sign on helical CT confirmed the ovarian origin, the sensitivity, specificity, positive predictive value and negative predictive value, and diagnostic accuracy were 92% (99/108), 87% (20/23), 97% (99/102), 69% (20/29), and 91% (119/131), respectively.
  
  
  CONCLUSIONS
  The presence of the ovarian vascular pedicle sign on helical CT is valuable for confirming the ovarian origin of a pelvic tumor and for differentiating an ovarian tumor from subserosal uterine myoma.
authors.affiliation: Department of Diagnostic Radiology, Ulsan University Hospital, Ulsan University College of Medicine, 290-3 Choenha-Dong, Dong-Gu, Ulsan, 682-714, Korea.
authors.forename: Jong Hwa
authors.initials: JH
authors.lastname: Lee
authors.forename: Yoong Ki
authors.initials: YK
authors.lastname: Jeong
authors.forename: Ji Kang
authors.initials: JK
authors.lastname: Park
authors.forename: Jae Choel
authors.initials: JC
authors.lastname: Hwang
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D007889:Leiomyoma / Q000000981:diagnostic imaging*; D008875:Middle Aged; D010051:Ovarian Neoplasms / Q000000981:diagnostic imaging*; D010386:Pelvic Neoplasms / Q000000981:diagnostic imaging*; D011237:Predictive Value of Tests; D011446:Prospective Studies; D012680:Sensitivity and Specificity; D036542:Tomography, Spiral Computed; D014594:Uterine Neoplasms / Q000000981:diagnostic imaging*