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1. Retroperitoneal metastatic poorly differentiated carcinoma with β-human chorionic gonadotropin secretion presenting as a psoas abscess

- Bingjin Wang

- Weifang Liu

- Zengwu Shao

- Xianlin Zeng

2. Undifferentiated Pleomorphic Sarcoma Presenting as Abdominal Pain with a Pulsatile Mass

- Arash Moradi

- Abolfazl Afsharfard

- Khashayar Atqiaee