PMC3325750_01
A) Non-enhanced computed tomography demonstrates an 11 cm well-demarcated, slightly heterogeneous, and round soft-tissue presacral mass (arrows) without nearby fat stranding; B) and C) the fat planes between the mass and the rectum (arrows in B) as well as the uterus (arrows in D) are obscure; D) sagittal view in bone window shows that the sacrum is intact.
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F1
Sagittal CT reconstruction revealed that the sacrum was intact (Figure 1).
A) T1WI of the lower abdomen demonstrates an encapsulated and isointense to hypointense presacral mass; B) the mass on T2WI is heterogeneously hyperintense; C) signal attenuation is not detectable in the mass on fat-suppressed T2WI; D) still some fat planes are obscure between the mass and the rectum (arrows).
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F2
T2WI, there was no signal attenuation in the mass as compared with the images on T2WI. The fat planes on MRI were more clearly identified between the mass and the uterus but still some fat planes were indefinite between the mass and the rectum (Figure 2).
A) The tumor on 20x magnification shows myxoid or hyalinized stroma; B) some tumor cells on 100x magnification form a chain-like arrangement; C) some tumor cells on 200x magnification form a nest-like arrangement; D) the tumor on 400x magnification presents epithelioid cells with vacuolated or pale-staining cytoplasm.
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F3
The arrangement of the tumor cells was in cords, chains or nests (Figure 3).