4Iwanski GB, Block A, Keller G, et al. Esophageal squamous cell carcinoma presenting with extensive skin lesions: a case report [J]. J Med Case Reports, 2008, 21(2): 115.
5Quint LE, Hepburn LM, Francis IR, et al. Incidence and distribution of distant metastases from newly diagnosed esophageal carcinoma[J]. Cancer, 1995, 76(7): 1120-1125.
6I_ookingbill DP, Spangler N, Sexton FM. Skin involvement as the presenting sign of internal earcinoma. A retrospective study of 7316 cancer patients[J]. J Am Acad Dermatol, 1990, 22(1): 19-26.
