Abstract

A 56-year-old male visited a local physician with intermittent abdominal pain. Ultrasonography revealed a mass of about 6cm arising from bowel and the patient was referred to our hospital. Clinically, a freely mobile mass was palpable in the right paraumbilical region. Ultrasound-guided fine-needle aspiration cytology (FNAC) showed features of a spindle cell tumor. On abdominal computed tomography, a tumor measuring 7x10x6cm in the right anterior para-renal space with uneven contrastenhanced effects was recognized displacing duodenum and inferior vena cava and encasing the aorta at L2 level. A diagnosis of retroperitoneal tumor was made, and surgery was performed. Histopathological examination revealed myxoid areas with pleomorphic stellate and spindle cells. The nucleoli were pleomorphic and hyperchromatic with prominent nucleoli. Many branching vessels were seen throughout with bizarre multinucleate giant cells. Features were consistent with high-grade myxofibrosarcoma.

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