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  Indian J Med Microbiol
 

Figure 2: (a) Typical carcinoid: Tumor cells are arranged in an organoid nesting and trabecular pattern, with a fine vascular stroma. Mitosis index <2/10 high power field (×20, H, and E). (b) Atypical carcinoid: Tumor cells are arranged in organoid pattern with moderate eosinophilic cytoplasm and finely granular nuclear chromatin. Mitotic index approximately 3/10 high power field (×20, H, and E). (c-e) Tumor cells are diffusely immunopositive for chromogranin, synaptophysin, and pancytokeratin, respectively (×40). (f) MIB-1 labeling index approximately 3% (×40)

Figure 2: (a) Typical carcinoid: Tumor cells are arranged in an organoid nesting and trabecular pattern, with a fine vascular stroma. Mitosis index <2/10 high power field (×20, H, and E). (b) Atypical carcinoid: Tumor cells are arranged in organoid pattern with moderate eosinophilic cytoplasm and finely granular nuclear chromatin. Mitotic index approximately 3/10 high power field (×20, H, and E). (c-e) Tumor cells are diffusely immunopositive for chromogranin, synaptophysin, and pancytokeratin, respectively (×40). (f) MIB-1 labeling index approximately 3% (×40)