A Case of Primary Esophageal Malignant Melanoma

A 68-year-old male presented with an abnormality on upper gastrointestinal endoscopy during a health check. He was diagnosed with malignant melanoma of the esophagus using biopsy tissue and admitted for surgery. Thoracicoabdominal computed tomography did not reveal any tumor lesions in the esophagus wall. Swelling of the lymph node and metastases were not found in other organs. The preoperative diagnosis was T1N0M0 and stage I disease, and an operation was performed. The patient was diagnosed with T1a-LPM, N0M0, stage 0 according to the Japanese Classification of Esophageal Cancer. Melanosis was diagnosed in gross appearance in the black mucous membrane part without the upheaval.