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1
Department of Radiology, St. Bartholomews Hospital, West Smithfield, London,
EC1A 7BE, England.
2
Department of Radiology, Royal Marsden Hospital, Downs Rd., Sutton, Surrey,
SM2 5PT, England.
3
Department of Oncological Gynaecology, St. Bartholomews Hospital, West
Smithfield, London, EC1A 7BE, England.
4
Department of Academic Radiology, St. Bartholomews Hospital, West Smithfield,
London, EC1A 7BE, England.
OBJECTIVE. The MR imaging appearances of uterine sarcomas are not well described in the literature. We describe the MR imaging features of uterine sarcomas.
MATERIALS AND METHODS. MR images from all patients with histologically proven uterine sarcomas scanned between 1993 and 2000 were reviewed. Tumor size, its relationship to the uterus, signal characteristics, and enhancement pattern after IV injection of gadolinium were noted.
RESULTS. Twenty-five scans from 22 patients were reviewed. Findings from the scans included 11 leiomyosarcomas, five mixed müllerian tumors, two rhabdosarcomas, and four endometrial stromal sarcomas. Two patterns of disease were observed, including a characteristic large heterogenous pelvic mass (n = 17) and an endometrial mass indistinguishable from endometrial carcinoma (n = 8). On T2-weighted images, the large masses were characteristically of low or intermediate background signal intensity with pockets of very high T2 signal. The areas of high T2 signal corresponded to cystic necrosis in the tumor. Pockets of high T1-weighted signal corresponded to hemorrhage. Gadolinium enhancement was present in the solid components of all tumors. This pattern was observed in all recurrent sarcomas. Some correlation was shown between the histologic subtypes and the MR imaging appearances.
CONCLUSION. Uterine sarcomas show two patterns on MR imaging. The most common presentation is a large heterogenous mass. However, sarcomas can mimic endometrial carcinoma.
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