Table 1.
Morphologic categories and features of serrated colorectal lesions.
| Histological Classification | Frequency (%) * | Location | Shape | Mucin Type | Size |
|---|---|---|---|---|---|
| Hyperplastic polyp (HP) | 80–90% | Distal | Sessile, Flat | Variable | <5 mm |
| Microvesicular HP (MVHP) | 60% | Distal | Sessile | Microvesicular | <5 mm |
| Goblet cell HP (GCHP) | 30% | Distal | Sessile | Goblet cells | <5 mm |
| Mucin poor HP (MPHP) | 10% | Distal | Sessile | Poor | <5 mm |
| Sessile serrated adenoma/polyp (SSA/P) | 15–20% | Proximal | Sessile/Flat | Microvesicular | >5 mm |
| Traditional serrated polyp (TSA) | 1–6% | Distal | Sessile/Pedunculated | Not present | >5 mm |
* Frequency of all serrated polyps.