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British Journal of Radiology (2005) 78, 68-71
© 2005 British Institute of Radiology
doi: 10.1259/bjr/28183033
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Rectus abdominis endometriosis: a report of two cases

V Coeman, MD 1 R Sciot, MD, PhD 2 and I Van Breuseghem, MD 1

Departments of 1 Radiology and 2 Pathology, University Hospitals, Catholic University Leuven, Leuven, Belgium



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  		Figure 1. Axial CT-image (W: 400 HU; L: 50 HU) through the lower pelvis after intravenous contrast administration showing the contrast-enhanced mass in the right lower rectus abdominis muscle (arrowheads).

 


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  		Figure 2. (a) Axial T2 weighted image with fat saturation (repetition time (TR) 5100 ms; echo time (TE) 60 ms) through the lower pelvic region showing an inhomogeneously multinodular hyperintense mass (white arrowheads) in the lowest segment of the right rectus abdominis muscle. (b) Axial T1 weighted image (TR 550 ms; TE 17 ms) demonstrating the same mass in the right rectus abdominis muscle (black arrowheads), which is nearly isointense to surrounding normal muscular tissue. (c) Axial T1 weighted image (TR 550 ms; TE 17 ms) with fat saturation again demonstrating the mass which is isointense to surrounding muscle and splaying surrounding vessels (arrowheads). (d) Axial T1 weighted image (TR 550 ms; TE 17 ms) after intravenous gadolinium contrast medium administration showing marked but inhomogeneous contrast enhancement of the mass in the right lower rectus abdominis muscle.

 


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  		Figure 3. Low power view of the tissue sample of the mass in the rectus abdominis muscle, showing the nests of endometriosis (arrowheads) in a fibrous background.

 


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  		Figure 4. Transverse ultrasound image centred on the mass in the right lower rectus abdominis muscle demonstrating the mass (arrowheads) which is inhomogeneously hyporeflective to surrounding muscle and focally ill-delineated.

 


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  		Figure 5. Axial CT-image (W: 400 HU; L: 50 HU) through the lower pelvis (a) before and (b) after intravenous contrast administration showing the mass in the right lower rectus abdominis muscle which is slightly enhancing (b).

 




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