A 50-year-old woman with long-standing rheumatoid ahritis complains of weakness and fatigue. She states that her stools have recently become black after taking a new nonsteroidal anti-inflammatory drug (NSAID). Gastroscopy shows numerous superficial, bleeding mucosal defects. Which of the following is the most likely diagnosis?
Acute erosive gastritis Early gastric cancer Helicobacter pylori gastritis Menetrier disease