PMC524188_01
Contrast enhanced computed tomography showing the tumor location between iliocostalis and psoas muscles in retroperitoneal space.
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F1
The medial margin of the tumor was deformed by a left transverse process of the second lumber spine, suggesting invasive behavior (Figure 1).
Coronal magnetic resonance imaging demonstrating the tumor beneath the left kidney.
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F2
T1-weighted phase and of heterogeneously high intensity in the T2-weighted phase. The marginal part showed very low intensity in both phases (Figure 2).
Gross appearance of the resceted tumor. The cut surface homogeneously appears gray and glossy.
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F3
On gross examination, the cut surface appeared homogeneously gray and glossy (Figure 3).
Photomicrograph showing the tumor composed of uniform spindled proliferation with moderate account of collagen fibers (hematoxylin and eosin x400).
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F4
Histologically, a uniform proliferation of spindle cells with a moderate amount of collagen fibers led to a diagnosis of extraabdominal fibromatosis in the retroperitoneal space (Figure 4).