case_images: PMC6216087_01
case_images: Contrast enhanced computed tomography of abdomen showing a large retroperitoneal mass.
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case_images: PMC6216087_01_gr1.jpg
case_images: fig0005
case_images: After contrast injection, tumoral mass was enhanced intensely (Fig. 1).
case_images: Magnetic Resonance Imaging showing an encapsulated and well limited retro peritoneal masse.
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case_images: fig0010
case_images: Imaging showed an encapsulated and well limited retro peritoneal masse occurring in hypo signal T1 and hyper signal T2 with intense enhancement after injection of Gadolinium. It is flush with the right intervertebral foramen L5-S1 (Fig. 2).
case_images: Intraoperative view after mass resection (A) and specimen (B).
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case_images: PMC6216087_01_gr3.jpg
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case_images: On exploratory laparatomy, a solitary large retroperitoneal multiloculated mass with hemorrhagic fluid was found (Fig. 3). A monobloc excision was performed (Fig. 3).
case_images: Microscopic examination showing tumor proliferation with variable cell density highly vascularized. (HE x 50).
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case_images: Further evaluation by immune histochemistry revealed that tumoral cells were positive for desmin, CD34, smooth muscular antigen, and negative for cytokeratin and CD31 (Fig. 4, Fig. 5).