Fig. 2

Peritoneum obtained by laparotomy. (200X) a H & E staining shows typical goblet cell carcinoid. The photomicrography shows goblet cell carcinoid composed of concentric infiltrating neoplastic cells in the appendiceal wall, including the mucosa, submucosa, muscular propria, and subserosal layers. The infiltrated wall shows fibrotic change. The tumor includes small solid or tubule-like tumor clusters, displaying monotonous nuclei with fine chromatin and eosinophilic cytoplasm, and occasional mucin-producing goblet cells arranged singly or small nests. b The Immunohistochemical study is positive for chromogranin A Brown color (arrow)