以下为句子列表：
英文: To our knowledge, only 20 cases of primary mediastinal hemangiopericytoma have been reported in the English literature, but no patient was reported with calcification.
中文: 就我们所知，仅有20例原发性纵膈腔血管外皮细胞瘤曾被报告于英文文献中，且尚无一例发现钙化的现象。
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英文: We present the first case of a mediastinal hemangiopericytoma with central calcification.
中文: 我们在此提出首例观察到中央钙化的原发性纵膈腔血管外皮细胞瘤。
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