A 55-year-old male was pointed out to have a reddish erosive lesion at the prepylorus and it was diagnosed as signet ring cell carcioma by a biopsyed specimen. So he was reffered to our hospital. We diagnosed that the lesion was within 5mm. EMR was performed. Three weeks later, an ulcer scar was observed at the same region. But four months later a Yamada-III type polypoid lesion was observed there. It was identified as a hyperplastic polyp by histological examination of polypectomied specimen.
The indication of EMR for poorly differentiated carcioma is still contraversial. In our hospital EMR is performed when the lesion diagnosed less than 5mm and located at the antrum in our hospital. A polyp which arise at the scar of EMR cannot be diagnosed correctly with endoscopy, so follow-up with endoscopic biopsy is very important.
