Intestinal polyps that can potentially grow into cancer:
Adenomatous polyp
Hyperplastic polyp
Juvenile polyp
Hamaomatous polyp
ADENOMATOUS POLYPS Most common neoplastic polyp is adenomatous, which harbors malignant potential. Most colon cancers arise from adenomatous polyps (adenoma). Conditions associated with adenomatous polyps : Strong association with ureterosigmoidostomies, acromegaly and streptococcus bovis bactermia. Probability of development of malignancy depends upon: Gross Appearance of lesion Histology Size Pedunculated Sessile (Increased risk) Tubular (MC) Tubulovillous Villous (Highest risk) <1 cm 1-2 cm >2 cm (Increased risk) Adenomatous Polyps Types Incidence Villous tissue Risk of Malignancy Tubular 65-80% < 25% 5% Tubulovillous 10-25% 25-75% 20% Villous 5-10% > 75% 40%
Large intestine