PMC6079617_01
(a) Magnetic resonance imaging showed that the tumor (T) was isointense with muscle (M) in the T1-weighted image. The tumor adjoins the left external iliac vein (arrow). (b) Positron-emission computed tomography scan showed abnormal integration at the tumor site.
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Magnetic resonance imaging showed that the mass was isointense with muscle in the T1-weighted image (Figure 1(a)). A positron-emission computed tomography (PET-CT) scan showed abnormal integration at the tumor site (Figure 1(b)).
(a) There were areas with high cellularity and bizarre nuclei. (b) Immunostaining for alpha-SMA was positive. (c) The positive ratio of MIB-1 was low (5-10%). (d) The tumor (T) was separated from the external iliac vein (black arrowhead), and only fibrous adhesions without infiltration were present.
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Furthermore, there were focal areas of high cellularity and bizarre nuclei (Figure 2(a)). Immunostaining for alpha-SMA (Figure 2(b)) was positive, and that for S-100, c-kit, and DOG-1 were negative. The positive ratio of MIB-1 was low at 5-10% (Figure 2(c)). Contrary to expectation, the tumor was separated from external iliac vein, where only fibrous adhesions without infiltration were present (Figure 2(d)).
(a) There were thick blood vessels, which were thought to be branching vessels (white arrowheads) of the left external iliac vein (black arrowhead). (b) Immunostaining for CD31 was positive, and we could identify the vascular endothelium. (c) The tunica media and tunica externa of this vascular wall were diminished and completely replaced by tumor cells. (d) The vessel intima was completely replaced by tumor cells, and the vessel wall structure was diminished.
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There was a thick blood vessel in the tumor that was thought to be a branch vessel of the left external iliac vein (Figure 3(a)). Its vessel intima was preserved, and immunochemical staining for CD31 was positive (Figure 3(b)). However, the tunica media and tunica externa of this vascular wall were diminished and completely replaced by tumor cells (Figures 3(c) and 3(d)).