Colonic Mucosubmucosal Elongated Polyp

Definition

Elongated pedunculated polyp of the colon
- Usually dumbbell or drumstick shaped
Surface covered by normal mucosa
- May be eroded
  - Lacks prominent granulation tissue
  - Lacks prominent crypt distortion
- No proliferation of muscularis mucosae
- Lacks any neoplastic component
Stroma ranges from loose and edematous to fibrotic
- Frequent dilated blood and lymphatic vessels
  - Characteristically show thick walled veins parallel to long axis of polyp
- No muscularis propria
- Inflammation not prominent
Mean length 3.7 cm, range 0.5-24
Rare, < 1% of polyps
- Usually an incidental finding
- Some cases associated with diverticulosis
Described in all segments of the colon
- Not described in rectum
Occurs in adults, 30-90 years
Benign, non-recurrent

Robert V Rouse MD
Department of Pathology
Stanford University School of Medicine
Stanford CA 94305-5342