The detection and surveillance of patients with premalignant gastric lesions could lead to early detection and treatment of gastric cancer. These lesions are mostly diagnosed in random biopsy samples obtained during conventional endoscopy. New endoscopic techniques, such as magnification endoscopy, may help the detection of neoplastic lesions. In this case series, we intended to emphasize the current problems in the detection and surveillance of gastric neoplasic lesions in clinical practice. Four cases with gastritis-like appearance on conventional endoscopy were identified with gastric dysplasia or carcinoma on histopathologic evaluation. We discussed the subjective interpretation of endoscopic findings, the challenges in the surveillance of low-grade dysplasia and the contribution of magnifying endoscopy on diagnostic accuracy. The performance of endoscopic examination and surveillance could be improved by magnified chromoendoscopy with targeted biopsies. An understanding of diagnostic challenges of gastric dysplasia is crucial in clinical management.