The report describes the clinical and morphological characteristics of inflammatory fibrosarcoma (6). Tumor occurred in the mediastinum, small pelvis and liver in patients aged 12-64 yrs. It featured infiltrative growth. Primary tumor relapsed in 2 cases, distant metastases - 4. Four patients died from tumor progression within 7-14 months after diagnosis. Tumors consisted of neoplastic fibroblasts and lymphofibroblasts with polymorphous nuclei and high mitotic activity.
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