恶性纤维组织细胞瘤（malignantfibroushistiocytoma）亦可称为恶性纤维黄色瘤及纤维黄色肉瘤，是好发于肢体软组织内的一种恶性肿瘤。发生于窦腔内者甚少，现将我们见到的2例报告如下。1病例介绍例1：朱某，男性，39岁，农民。因右侧鼻腔堵塞并右面部肿胀2年而于1998年7月6日 Malignant fibrous histiocytoma (malignant fibrohistiocytoma) also known as malignant fibrous xanthomas and fibrous yellow sarcoma, is a malignant tumor that occurs in the soft tissue of the limbs. There are very few in the sinus cavity, now we see the 2 cases reported as follows. A case introduction Example 1: Zhu, male, 39 years old, farmer. Due to blockage of the right nasal cavity and swelling of the right side for 2 years on July 6, 1998