PMC6745113_01
(a) Transverse section of postcontrast T1 MRI abdomen revealed a well-circumscribed mass located between the external and internal oblique muscles. (b) T2W MRI clearly delineates the capsule of the lesion and internal morphology. (c) The lesion is intensely hyperintense on fat-suppressed MRI.
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Computed tomography (CT) scan of the abdomen with contrast revealed a 32 x 45 mm cystic mass located between the external and internal oblique muscles (Figure 1(a)). The lesion was hyperintense on T2 (Figure 1(b)), and fat-suppressed sequences suggested cystic degeneration (Figure 1(c)).
(a) Perioperative image revealing the nodular mass. (b) Image of the resected specimen.
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The patient underwent total resection of the mass under local anaesthesia (Figure 2(a)). Macroscopic examination of the resected specimen revealed a well-circumscribed nodular mass measured 6.5 x 4.5 x 3.5 cm (Figure 2(b)).
(a, b) Hematoxylin and Eosin stain (H&E) from the tumor wall. Spindled Schwann cells forming hypercellular Antoni A areas with nuclear palisading and Verocay bodies with alternating hypocellular-myxoid area (Antoni B). (c) The tumor cells stained positive for S-100 protein.
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Histopathology findings were characterized by interlacing bundles of spindle cells of varying cellularity and peripheral lymphoid cuffs (Figures 3(a)-3(b)). The neoplastic cells were immunoreactive with S-100 protein (Figure 3(c)) and vimentin.