A CASE OF PELVIC GIANT HEMANGIOPERICYTOMA

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  • 骨盤内原発巨大hemangiopericytomaの1例

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Abstract

A 31-year-old man was admitted to the hospital because of a lower abdominal mass. The tumor was huge, pain-less, elastic hard and poorly mobile. Findings of ultrasonography, CT, MRI and angiography indicated a hemangiopericytoma arising from the ventral side of the sacrum. The tumor was extirpated. Histopathologic examination of surgical specimen of the tumor revealed less malignant hemangiopericytoma because of a growth of round or spindle cells surrounding capillary blood vessels and few mitotic figures. No recurrence was evidenced for 4 years after the complete resection with free-tumor margins. So far only 21 cases of hemangiopericytoma originated from the pelvis have been reported in Japan. Image diagnostic and clinicopathologic characteristics were analyzed based on these reported cases. No specific findings for malignancy on imagings could be drawn out, although every angiograph showed tumor stain and neovasculatity mimicking malignancy. Even by histophatologic examination, there are many arguments in distinguishing between malignant and benign tumors.

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