PMC7093908_01
Axial (a) and coronal (b) views of CT scan of the abdomen and pelvis. Notice the right lower quadrant mass (white arrow) with low attenuation over the central region.
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fig1
A repeat CT of the abdomen and pelvis revealed a well-circumscribed mass anteriorly adjacent to the cecum and just deep to the intra-abdominal wall musculature, measuring 4.4 cm in transverse dimension and 4.0 cm in anteroposterior dimension, with low attenuation in the central region (Figure 1).
(a) Well-circumscribed spindle cell lesion with peripheral lymphoid aggregates (hematoxylin-eosin, original magnification x4). (b) The lesion is moderately cellular composed of bland spindle cells within a neurofibrillary background (hematoxylin-eosin, original magnification x10). (c) S-100 immunohistochemical study shows diffuse positivity (original magnification x10).
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fig2
CT-guided core needle biopsy revealed spindle cells under hematoxylin and eosin (H&E) sections (Figures 2(a) and 2(b)). Immunohistochemical analysis of these spindle cells was positive for S-100 and synaptophysin (Figure 2(c)).