Gastroenterology clinical image challenge: A 69-year-old woman with a history of acute hepatitis A underwent esophagogastroduodenoscopy during an annual health check-up. The patient had no abdominal symptoms and laboratory test results were unremarkable. Esophagogastroduodenoscopy showed a slightly reddish mucosa in the cervical esophagus. A flat elevated lesion of irregular shape was identified in the distal side of the slightly reddish mucosa (Figure). Chromoendoscopy with indigo carmine demonstrated a clear demarcation line around the circumference of the lesion.
What is the diagnosis?
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