PMC8084675_01
Coronal CT: located in the anatomic region of the right iliac fossa, a low-attenuation cystic lesion that measures 3.3 cm x 6.5 cm with asymmetric wall thickening (red arrow) and focal calcification (black arrow). Peritumoral ascitic fluid can be detected (white arrow).
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Distal metastases or pathological regional lymph nodes were not identified (Figure 1).
Gross specimen showing the dilated appendix.
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Macroscopic examination of the specimen revealed a gross dilatation of the appendix measuring 6.5 x 4.5 x 4 cm with abundant mucin in the lumen (Figure 2).
(a) Histopathology of low-grade mucinous neoplasm of the appendix characterized by flat mucinous epithelial proliferation replacing the mucosa and fibrosis of the wall. H/E x400. (b) Mucin-producing columnar glandular epithelium with low-grade dysplasia H/E x200.
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Normal morphological characteristics of an appendix were not recognized (Figure 3). There was fibrosis of the underline wall with scattered residual smooth muscle fibers throughout the caecal wall (Figure 3).