Histologic types of rectal cancer include:

• Adenocarcinoma (most rectal cases).
  • Mucinous (colloid) adenocarcinoma.
  • Signet ring adenocarcinoma.
• Scirrhous tumors.
• Neuroendocrine:[1] Tumors with neuroendocrine differentiation typically have a poorer prognosis than pure adenocarcinoma variants.
• Carcinoid tumors. (Refer to the PDQ summary on Gastrointestinal Carcinoid Tumor Treatment for more information.)

References

1. Saclarides TJ, Szeluga D, Staren ED: Neuroendocrine cancers of the colon and rectum. Results of a ten-year experience. Dis Colon Rectum 37 (7): 635-42, 1994.  [PUBMED Abstract]
   
   

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