PMC9626234_01
Radiographic images showing the mass. (a) Transvaginal ultrasound: the mass (arrowheads) was 51.7 x 32.5 mm in size. (b) Plain magnetic resonance image of the abdomen and pelvis. An irregular mass (arrowheads) can be seen superior to the vagina.
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Transvaginal ultrasound revealed a 51.7 x 32.5 mm mass with hypervascularity (Figure 1(a)). T2-weighted image. The boundaries of the mass were clear and did not appear to involve the rectum and vagina. The mass was in the rectovaginal septum, but its origin was uncertain (Figure 1(b)).
Pathological findings. (a) Macroscopic findings: the cut surface of tumor was smooth, light brown, and solid, and no necrosis was observed. (b) On hematoxylin and eosin staining: spindle-shaped cells with nuclear atypia were arranged in a bundle and had proliferated. (c, d) On immunohistochemistry examination: CD34 and CD117 (KIT) were positive.
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On the cut section, the tumor was light brown, and there was no evidence of rupture (Figure 2(a)). Mitosis and apoptosis were occasionally seen; typical mitoses were 2-4/50 high-power fields (Figure 2(b)). Immunohistochemically, the tumor cells were positive for CD34 (Figure 2(c)) and CD117 (KIT) (Figure 2(d)) but negative for SMA, desmin, and S100 protein.