A 63-year-old woman with type 2 diabetes presented with a 2-day history of hematemesis and black stool. Esophagogastroduodenoscopy revealed longitudinal, black lesions in the lower esophagus.
What is the diagnosis?
a. Malignant melanoma
b. Esophageal acanthosis nigricans
c. Acute esophageal necrosis
d. Esophageal melanocytosis
e. Coal dust deposition
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