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Retroperitoneal malignant solitary fibrous tumor with second recurrence and lymphatic metastases: A case report

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Malignant solitary fibrous tumor (SFT) in the retroperitoneum is rare. The present study reported on the case of a 67-year-old man who had retroperitoneal SFT for ~13 years, which resulted… Click to show full abstract

Malignant solitary fibrous tumor (SFT) in the retroperitoneum is rare. The present study reported on the case of a 67-year-old man who had retroperitoneal SFT for ~13 years, which resulted in two recurrences and lymphatic metastases. After the second recurrence, the patient presented with hematochezia and multiple retroperitoneal masses were found through computed tomography (CT). Histopathological examination showed that the tumor was mainly comprised of short spindle cells, arranged into sparse and dense areas. Mitotic figures were observed, generally 6–8 mitoses/10 high power fields, along with local necrosis. The tumor invaded the circumferential liver, intestines, lymphatic vessels and lymph nodes. Combined with the immunohistochemical results, it was diagnosed as a malignant SFT, which regrew just 2 months after the latest surgery. Retroperitoneal SFTs with repeated relapses, infiltrative growth and lymphatic metastasis suggest the need for careful and long-term follow-up.

Keywords: fibrous tumor; retroperitoneal; malignant solitary; lymphatic metastases; tumor; solitary fibrous

Journal Title: Oncology Letters
Year Published: 2022

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