Synchronous metastasis of metachronous tumor: a case report

Recent advancements in cancer treatment have increased the
incidence of secondary tumors and metachronous tumors by
means of improving survival rates. Increased risk of secondary
cancer is observed after radiotherapy and chemotherapy
episodes. It is a clinical observation to now encounter
recurrences many years after a successful treatment or a primary
resection of a tumor. How a tumor cell persists alive but
stable and how it demonstrates its tumorigenic potential
remain to be clarified. A patient with colon adenocarcinoma
and coexisting malignant melanoma who presented synchronic
metastasis in the follow-up is presented in this manuscript.

Keywords: Secondary tumor; carcinoma; metachronous neoplasm; synchronous neoplasm