Pulmonary intimal sarcoma presenting as an ascending colonic polyp and mimicking a gastrointestinal stromal tumour

cases have been described, and most of them are large ulcerating tumours with gastrointestinal haemorrhage. The most common primary lesion metastatic to the stomach includes lung, breast, and melanoma. Endoscopy is an important diagnostic tool evaluating metastatic gastric lesions. Although the tumours were very small, our case can be classified as multiple nodules of varying size with tip ulceration arising on the crests of normal rugae. Pathologically, metastatic tumours can be distinguished from gastric carcinoma based on the absence of cellular atypia in the gastric glandular structures. In our case, clear tumour cells comprising renal cell carcinoma bore a close resemblance to signet ring cell carcinoma of the stomach. Our case is unique due to the smaller size, similar endoscopic and pathological findings to primary gastric carcinoma, and synchronous occurrence with primary gastric carcinoma. Synchronous metastatic renal cell carcinoma and primary gastric adenocarcinoma have not been reported.