Many of the colorectal cancers originales from polips.We wanted to discuss a case accompanied with literature who has a complicated giant rectal polip which presented with an unusual clinic and confusion in diagnosis. 36 years old male patient.He has cramp like stomache and changing in volonic habits for about a year.During colonoscopy a malign mass in caecum and a giant villous adenoma in rectum is identified.The mass in caecum is excised via laparoscopic surgery.The mass in rectum received polipectomy via local excision.Altough a cancer has seen in the polip the surgery is considered opprepriote because of the surgical frontier and acceptable histologic properties. Colorectal polips are lesions which has the risk to turn into cancers thus, detoiled histopatologic examination and gently decission of surgery is needed.