A 46 years old male presented with lump in abdomen in left hypochondriac region. His ultrasound abdomen was suggestive of a mass arising from stomach. His CT Abdomen and pelvis report was large isodense soft tissue mass arising from greater curvature of stomach with large exophytic component and less endophytic component. But his endoscopy was within normal limits with no mucosal lesions. His tru–cut biopsy report was spindle cell tumour. So the preoperative diagnosis was spindle tumour of stomach. When he operated by exploratory laparotomy, he was found to have 15*17 cm mass involving the wall of greater curvature of stomach with no intraluminal component. He was operated as proximal partial gastrectomy with esophagogastrostomy. His postoperative period was unconventional. His histopathological report was spindle cell gastrointestinal stromal tumour of stomach. His immunohistochemistry report was strongly positive for c–kit (CD 117). One month after the surgery the patient is healthy without an evidence of metastasis.