Struma ovarii: MR findings.
OBJECTIVE
The purpose of this study was to determine the MR appearance of struma ovarii correlating with the pathological features.


METHODS
MR findings of two patients with struma ovarii were retrospectively reviewed and compared with the pathological findings.


RESULTS
Both tumors were complex masses composed of multiple cysts and solid components. The size and signal intensity of multiple cysts varied within the tumor. Hyperintense cystic areas on T1-weighted images were thought to correspond pathologically to hemorrhagic cysts and follicles containing viscous proteinaceous colloid. Solid components had as high a signal intensity as did uterine endometrium on T2-weighted images and as intermediate a signal intensity as did uterine muscle layer on T1-weighted images. After intravenous administration of gadolinium-DTPA, the solid components showed marked contrast enhancement. There was also ascitic fluid associated with adhesion and peritoneal thickening.


CONCLUSIONS
The characteristic MR appearance of struma ovarii is thought to be a mixed mass composed of T2-hyperintense solid components with intense contrast enhancement and multiple T1-hyperintense cystic areas suggestive of hemorrhagic degeneration and viscous proteinaceous colloid.
Dohke
M
M
Department of Radiology, Kurashiki Central Hospital, Japan.
Watanabe
Y
Y
Takahashi
A
A
Katayama
T
T
Amoh
Y
Y
Ishimori
T
T
Okumura
A
A
Oda
K
K
Mitsudo
K
K
Minami
K
K
Ukita
M
M
Dodo
Y
Y
D000328:Adult; D003287:Contrast Media; D005260:Female; D005682:Gadolinium; D019786:Gadolinium DTPA; D006801:Humans; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D009942:Organometallic Compounds; D010051:Ovarian Neoplasms / Q000175:diagnosis* / Q000473:pathology; D004369:Pentetic Acid / Q000031:analogs & derivatives; D012189:Retrospective Studies; D013330:Struma Ovarii / Q000175:diagnosis* / Q000473:pathology
D003287:Contrast Media; D009942:Organometallic Compounds; D004369:Pentetic Acid; D005682:Gadolinium; D019786:Gadolinium DTPA