Abstract
A 66-year-old man presented to his previous physician with epigastric discomfort in 2014. He was then referred to our hospital due to suspected primary malignant melanoma of the esophagus (PMME). A biopsy showed atypical cells containing melanin granules. A diagnosis of PMME was thus made. We investigated the endoscopic findings of the previous physician, which revealed a black point-like pigmentation at the same site since 2009. In 2010, black pigmentation was also observed at the same site. Although esophageal melanosis was suspected, no biopsy was performed. This case demonstrates the process by which esophageal melanomas develop into malignant melanomas.
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