The pararectal lymph nodes are in contact with the muscular coat of the sucioent.com drain the descending iliac and sigmoid parts of the colon and the upper part of the rectum; their efferents pass to the preaortic sucioent.com: Lymphatic system. Note 1: Code only regional nodes and nodes, NOS in this field. Distant nodes are coded in CS Mets at DX. Note 2: Use codes for anal canal unless tumor is stated to occur at the anus, arising just proximal to the squamous mucocutaneous junction or the anal verge. Thank you for clarifying, This is not likely to be a lymph node. It is more likely to be an abscess. While antibiotics can be slightly helpful, if this is an abscess the treatment that is usually necessary is to have this open and the pus drained.