Gastric Tumor - Intraperitoneal Metastases

Slide #3476

The patient is a 67-year-old woman who presented in 1997 with abdominal pain and "feeling full" after meals. CT scan had demonstrated a mass, which was biopsied, leading to a partial gastrectomy. She returned to the OR in 1998 for resection of tumor metastases from the abdominal wall and liver and again in 1999 for resection of metastases in the pancreas and liver. In the summer of 2000, additional local intra-abdominal recurrences were resected. The recurrent intraperitoneal tumor is the source for the tissue on this slide.

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Questions

1. What are the cytologic features of the constituent cells of this tumor?
2. Based on these features, is the tumor of epithelial or mesenchymal origin?
3. Is the tumor benign or malignant? What criteria did you use to determine this?
4. Which is the appropriate term for this tumor?
5. Since this tumor first arose in the stomach, what part of the stomach wall gave rise to the tumor? Is this a common or uncommon gastric tumor? What is the most common benign tumor? And malignant tumor?