Primary advanced esophago-gastric melanoma: A rare case

Table 1 Tumor-node-metastasis classification by the American Joint Comission on Cancer staging for melanoma of the upper aerodigestive tract

T	Tx	Tumor cannot be evaluated
	T0	No signs of tumor
	T3	Epithelium/submucosa (mucosal disease)
	T4a	Deep soft tissue, cartilage, bone or overlying skin
	T4b	Brain, dura, skull base, lower cranial nerves, masticator space, carotid artery, prevertebral space, mediastinal structures, cartilage, skeletal muscle or bone
N	Nx	Regional lymph nodes cannot be evaluated
	N0	Tumor cells absent from regional lymph nodes
	N1	Regional lymph node metastasis present
M	M0	No distant metastasis
	M1	Metastasis to distant organs