This patient underwent surgery (left hemicolectomy) with diagnosis confirmation of synchronous adenocarcinoma NOS pT4a, N2b.

Synchronous colorectal cancers are characterized by the presence of others distinct tumoral foci at diagnosis, intra-operatively, or within 6 months of the resection of the primary lesion. After the 6 months, a new distinct colorectal cancer is called metachronous ¹.