PMC4303757_01
(A) Contrast enhanced computed tomography; lobulated well enhancing mass in the upper-pelvic cavity is very close to left iliac vessels. (B) Same mass in the mid-pelvic cavity is located around uterus and left ovarian cyst.
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F1
Pelvic computed tomography (CT) revealed a 12x9 cm2, lobulated and well-enhanced mass (Fig. 1).
Laparoscopy shows that bluish-colored huge mass is located along the sacrum in the pelvic retroperitoneum.
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F2
The surface of tumor was fragile to bleed easily during dissection (Fig. 2).
(A) The tumor was a circumscribed mass and had many variable sized vessels (H&E, x100). (B) The tumor was composed of high cellular spindle cells having irregular patterns and moderate cytologic atypia. Mitosis was occasionally seen (H&E, x400). (C) The tumor cells were reactive for CD34 (x200).
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F3
Histologically, the tumor showed a richly vascular pattern consisting of large and small vessels lined by a single layer of flattened endothelial cells (Fig. 3A). Mitosis was 1/10 on the average in high power fields (HPF) as shown in Fig. 3B. Immunohistochemically, these cells were positive for CD34 (Fig. 3C) but negative for pancytokeratin, smooth muscle actin, desmin, S-100 protein, CD31, factor VIII, c-kit, and HMB45.