Fig. 4.

Microscopic appearance of ovarian carcinoid tumor. Photomicrograph showing solid nests and broad trabeculae of tumor by cellular proliferation. These patterns were lined with one to two layers of cells (hematoxylin-eosin, 100×) (A). The regular round tumor cells have uniform rounded nuclei and abundant fibrovascular stroma (hematoxylin-eosin, 400×) (B). Immnuohistochemistry stains for neuroendocrine marker of the tumor cells reveals diffuse, strong, granular, and cytoplasmic staining (brown color) with chromogranin A (chromogranin, 100×) (C).