However, upon laparoscopic excisional biopsy of a peritoneal lesion, pathology revealed a tumor with spindle/polygonal cell morphology (Fig. 1), cluster of differentiation (CD117) and discovered on GIST 1 (DOG-1) positivity (Fig. 2) and negative CD34 immunohistochemistry, consistent with a diagnosis of extra-gastrointestinal stromal tumor of the omentum metastatic to the ovaries and bilateral iliac lymph nodes. The gene discussed is KIT; the disease is neoplasm.