PMC9619143_01
Axial computed tomography scans reveals a distinct ovoid cystic mass between the liver and the right diaphragmatic crus.
gr1.jpg
PMC9619143_01_gr1.jpg
fig0001
On the axial CT scans, we observed a distinct ovoid, peripherally mildly enhancing low-density mass measuring 10 cm in the retroperitoneal space (Fig. 1A and B).
(A, B). On contrast-enhanced coronal and sagittal computed tomography scans, the mass has compressed and displaced the inferior vena cava lateral anteriorly. Fluid-fluid level has been observed within the mass (A). Particular septa-like structures are located superior to the aspect of the mass (A and B).
gr2.jpg
PMC9619143_01_gr2.jpg
fig0002
It was located posterior to the liver, and the inferior vena cava (IVC) was compressed and displaced anteriorly (Fig. 2A and B). Fluid-fluid levels were observed within the mass (Fig. 2A). Moreover, we observed some septa-like structures on the superior aspect of the mass (Fig. 2A and B).
(A) A gross specimen reveals a cystic mass measuring 10 x 8 x 4 cm. (B) On the cut surface, the wall of cystic mass is thick-whitish and myxoid with multilocular cystic changes (arrows). (C) Microscopic examination reveals the proliferation of spindle cells, which form the Verocay body (circle, hematoxylin and eosin stain, x100). (D) Immunohistochemistry reveals the strong and diffuse staining of the S100 protein (x100).
gr3.jpg
PMC9619143_01_gr3.jpg
fig0003
The inner surface was covered with a dark brownish exudate (Fig. 3A). On the cut surface, the cystic mass had a thick, whitish, and myxoid wall, with multilocular cystic changes (Fig. 3B). Two nuclear palisading regions and an anuclear zone comprised one Verocay body (Fig. 3C). Immunohistochemistry revealed strong and diffuse S100 protein staining (Fig. 3D).