Myogenic stromal tumors of the stomach: personal experience

Myogenic gastric tumours are a rare pathology and present difficulties in terms of nosographic classification, which in most cases can be overcome thanks to improvements in imaging and immunohistochemical techniques. Over the period 1995-1999 we observed 5 patients with aspecific dyspeptic symptoms and occasional epigastric pain, suffering from non-epithelial gastric tumours, associated, in one case, with a carcinoma of the stomach. Histological examination of endoscopic biopsies was inconclusive for a definite histopathological diagnosis, while intraoperative biopsies showed the myogenic origin and the absence of morphostructural abnormalities. In the light of these data, we performed three wedge resections, one distal gastric resection and, in the patient with advanced gastric cancer, a D3 total gastrectomy. Histological examination, immunohistochemistry and cytofluorometry enabled us to diagnose stromal tumours with a low risk of malignancy in all cases. At follow-up after 9-54 months all patients are still alive and free of disease. Though the preoperative diagnosis of stromal tumours is possible with endosonography and CT, only histology, immunohistochemistry and cytofluorometry enable us to define the condition nosographically and establish a prognosis with sufficient accuracy to allow correct surgical treatment. A prolonged follow-up is always necessary to identify eventual relapses and/or metastases, which are particularly frequent in the borderline group or in cases with a high risk of malignancy.