Some tumors may appear as signet ring carcinomas. Some tumors may exhibit carcinod features and some show squamous differentiation. May be asymptomatic for years. May present as rectal bleeding, iron deficiency due to gradual loss of blood, fatigue, abdominal discomfort or pain to bowel obrstruction. May first present with hepatomegaly due to presence of metastasis.
Prognosis depends on the extent of invasion.