Gastrointestinal stromal tumors of the stomach: two case reports.

Gastrointestinal stromal tumors, commonly known as GISTs, are non-epithelial gastrointestinal neoplasms seen with increasing frequency in clinical practice. These tumors were formerly classified as leiomyoblastomas or leiomyosarcomas. Recent advances in immunohistochemistry have identified gastrointestinal stromal tumors as a unique entity.