Definition : All tumors in the gastrointestinal tract arising from mesenchymal cells (mesoderm)
except those of smooth muscle cells (leiomyoma) or schwann cells (schwannoma). [MeSH];
All tumors in the gastrointestinal tract arising from mesenchymal cells (mesoderm)
except those of smooth muscle cells (leiomyoma) or schwann cells (schwannoma). [MeSH]