Signet ring cell carcinoma of the rectum: atypical metastatic presentation.

Colorectal cancer is the third most common cancer in the world and the fourth most common cause of death related to cancer. Signet ring cell carcinoma represents an uncommon histological type for rectal cancer with less than 1% of all rectal neoplasms. It usually behaves aggressively and has an inferior prognosis. We present the case of a young man diagnosed with signet ring cell rectal carcinoma. He underwent neoadjuvant therapy with partial response, had surgery with curative intent and showed local recurrence after only 3 months. Disease progression happened only weeks after recurrence with metastasis to vertebrae, extraocular muscles, bone marrow and skin. He is currently receiving palliative chemotherapy. © BMJ Publishing Group Limited 2019. No commercial re-use. See rights and permissions. Published by BMJ.