1. McCormack PM, Nascimento AG, Bains MS, Knapper WH, Zaman MB. Primary melanocarcinoma of the esophagus. Clin Bull. 1979;9:162–4.
2. Suzuki H, Nagayo T. Primary tumors of the esophagus other than squamous cell carcinoma—histologic classification and statistics in the surgical and autopsied materials in Japan. Int Adv Surg Oncol. 1980;3:73–109.
3. Turnbull AD, Rosen P, Goodner JT, Beattie EJ. Primary malignant tumors of the esophagus other than typical epidermoid carcinoma. Ann Thorac Surg. 1973;15:463–73.
4. Sabanathan S, Enj J, Pradhan G. Primary malignant melanoma of the esophagus. Am J Gastroenterol. 1989;84:1475–81.
5. Taniyama K, Suzuki H, Sakuramachi S, Toyoda T, Matsuda M, Tahara E. Amelanotic malignant melanoma of the esophagus: case report and review of the literature. Jpn J Clin Oncol. 1990;20:286–95.