PMC6260368_01
Contrast-enhanced CT showed an enlarged and diffusely thickened appendix (appendix: thick white arrow head).
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Contrast-enhanced computed tomography (CT) demonstrated an enlarged and diffusely thickened appendix (Fig. 1a, b).
Colonoscopy showed a thickened mucosa of appendix projecting to the cecum without outflow of abscess or jellylike liquid.
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Colonoscopy showed thickened appendiceal mucosa projecting to the cecum without evidence of abscess or jellylike liquid (Fig. 2).
The resected specimen showed the appendiceal wall was fibrotic, enlargement, and thickness. There was no evidence of appendiceal rupture or serosal mucin extravasation (a). Histopathological examination showed atypical mucinous epithelial cells were lining by a single layer in the appendix (b). Multiple neurofibromas were revealed in the muscle layer, submucosa and mucosa of the appendix (c). Immunohistochemistry examination showed positive for S-100 (d).
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There was no evidence of appendiceal rupture or serosal mucin extravasation (Fig. 3a). Histopathological examination showed a single layer of atypical mucinous epithelial cells lining the appendix (Fig. 3b). Multiple neurofibromas were observed in the muscle layer, submucosa and mucosa of the appendix (Fig. 3c). Immunohistochemical examination showed positive staining for S-100 (Fig. 3d).