Unknown metastases

Primary unknown metastatic cancer is a type of metastatic cancer confirmed by biopsy but no primary site can be found. It is not easy to find because of small lesions, concealed locations or submucosal reasons, and the biological behavior of the tumor is worse, and metastasis occurs earlier. It is especially important to look for the primary lesions clinically. Only by finding the primary lesions and treating both the symptoms and the symptoms can the clinical cure rate be improved.