PMC7069535_01
Basal abdominal CT scan revealing an oval-shaped, homogenous mass, with muscular density, developed in the subcutaneous tissues of the anterior abdominal wall. The mass is well-circumscribed with regular limits clearly differentiated from the surrounding structures
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F1
A basal computed tomography (CT) revealed a 7x5 cm well-circumscribed tissue-mass located in the subcutaneous plane of the right iliac fossa (Figure 1).
Post-contrast abdominal CT scan (later phase) revealing a mild and homogeneous enhancement with a few scattered liquid chambers
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F2
After intravenous administration of contrast media, the lesion showed a modest and homogeneous enhancement with a few scattered liquid chambers (figure 2).
Operative view showing a well-defined subcutaneous mass easily enucleated through a selective incision in the right iliac fossa
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F3
The mass was easily enucleated after a direct anterior approach by a selective incision in the right iliac fossa (figure 3). 
Macroscopic view of the resected specimen showing an encapsulated solid tumor with heterogeneous appearance and the presence of hemorrhagic as well as mucoid changes
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F4
Macroscopically, no obvious necrosis was observed (figure 4). 
Microscopic findings: Tumor proliferation composed of spindle-shaped cells with a benign appearance. No evidence of mitosis or cytonuclear atypia (hematoxylin-eosin staining, original magnification x10)
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F5
Microscopically, the tumor was composed of proliferating spindle cells arranged in bundles without cytonuclear atypia or abnormal mitoses (Figure 5).
Immunohistochemical study showing strong and diffuse staining for the S-100 protein. (immunohistochemistry, original magnification x40)
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F6
Immunohistochemistry showed that the tumor-cells were strongly and diffusely positive for S100 protein, which is consistent with the diagnosis of benign schwannoma (Figure 6).