Magnetic resonance imaging findings of endometrioid adenocarcinoma of the ovary.
OBJECTIVE
We assessed magnetic resonance imaging (MRI) features and clinical characteristics of ovarian endometrioid adenocarcinoma.


METHODS
A total of 31 patients with 39 surgically proven ovarian endometrioid adenocarcinomas were analyzed retrospectively. Histologically, 13 lesions in 12 patients arose from proven endometriomas (group A), and 26 lesions in 19 patients did not coexist with endometrioma (group B). The morphological pattern of the lesion on MRI was classified as a solid or a cystic type: A solid type was defined as a solid component occupying more than half of the lesion; and a cystic type was a cystic lesion with one or more mural nodules.


RESULTS
Altogether, 11 lesions in group A were the cystic type on MRI, whereas 24 lesions in group B were the solid type (P < 0.0001). Among the 11 cystic-type lesions in group A, the cysts of 5 lesions were hypointense on T1-weighted images, and the cysts of 6 lesions were hyperintense on T1- and T2-weighted images without "shading." The nuclear grade was higher (P = 0.0028) and the clinical stage more advanced (P = 0.0018) in group B compared to group A.


CONCLUSIONS
MRI of ovarian endometrioid adenocarcinomas revealed two types: a solid type and a cystic type. The lesions arising from endometriomas tended to be the cystic type on MRI and have a good prognosis. Preexisting endometrioma in this entity rarely showed "shading" on T2-weighted images.
Kitajima
Kazuhiro
K
Department of Radiology, Dokkyo Medical University School of Medicine, 880 Kita-kobayashi, Mibu, Shimotuka-gun, Tochigi, 321-0293, Japan. kazu10041976@yahoo.co.jp
Kaji
Yasushi
Y
Kuwata
Yoichiro
Y
Imanaka
Kazufumi
K
Sugihara
Ryo
R
Sugimura
Kazuro
K
D000230:Adenocarcinoma / Q000473:pathology*; D000328:Adult; D000368:Aged; D003287:Contrast Media; D016889:Endometrial Neoplasms / Q000473:pathology*; D005260:Female; D019786:Gadolinium DTPA; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008875:Middle Aged; D010051:Ovarian Neoplasms / Q000473:pathology*; D012189:Retrospective Studies; D018709:Statistics, Nonparametric
D003287:Contrast Media; D019786:Gadolinium DTPA
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