case_images: PMC9897692_01
case_images: Computed tomography scan, axial section showing a huge mass in the right anterior pararenal space, abutting inferior vena cava
case_images: cureus-0015-00000033332-i01.jpg
case_images: PMC9897692_01_cureus-0015-00000033332-i01.jpg
case_images: FIG1
case_images: No fat or calcification was noted within the lesion (Figure 1).
case_images: PMC9897692_02
case_images: Postoperative specimen showing the lobulated retroperitoneal mass with congested blood vessels
case_images: cureus-0015-00000033332-i02.jpg
case_images: PMC9897692_02_cureus-0015-00000033332-i02.jpg
case_images: FIG2
case_images: The outer surface of the mass was smooth and well-encapsulated with congested blood vessels (Figure 2).
case_images: Photomicrograph showing the presence of spindle cells displaying moderate pleomorphism in the form of vesicular chromatin, prominent nucleoli, and a few interspersed multinucleate giant cells (Hematoxylin and Eosin 100x resolution)
case_images: cureus-0015-00000033332-i03.jpg
case_images: PMC9897692_02_cureus-0015-00000033332-i03.jpg
case_images: FIG3
case_images: These spindle cells are large, with a severe pleomorphic nucleus, vesicular chromatin, prominent nucleoli, and a moderate amount of cytoplasm, in an abundant collagenous stroma (Figure 3 and Figure 4).
case_images: Photomicrograph showing extensive collagenization (Hematoxylin and Eosin 100x resolution)
case_images: cureus-0015-00000033332-i04.jpg
case_images: PMC9897692_02_cureus-0015-00000033332-i04.jpg
case_images: FIG4
case_images: These spindle cells are large, with a severe pleomorphic nucleus, vesicular chromatin, prominent nucleoli, and a moderate amount of cytoplasm, in an abundant collagenous stroma (Figure 3 and Figure 4).
case_images: Vimentin stained section showing membranous and cytoplasmic positivity in tumor cells
case_images: cureus-0015-00000033332-i05.jpg
case_images: PMC9897692_02_cureus-0015-00000033332-i05.jpg
case_images: FIG5
case_images: PMC9897692_03