| Theme | New Development of Laterally Spreading Tumor | |
|---|---|---|
| Title | The Characteristics of Rectal LSTs Compared to Colonic LSTs | |
| Publish Date | 2015/08 | |
| Author | Akiko Chino | Department of Gastroenterology and Endoscopy, Japanese Foundation for Cancer Research Cancer Institute Hospital |
| Author | Kenjiro Morishige | Department of Gastroenterology and Endoscopy, Japanese Foundation for Cancer Research Cancer Institute Hospital |
| Author | Hirotaka Ishikawa | Department of Gastroenterology and Endoscopy, Japanese Foundation for Cancer Research Cancer Institute Hospital |
| Author | Teruhito Kishihara | Department of Gastroenterology and Endoscopy, Japanese Foundation for Cancer Research Cancer Institute Hospital |
| Author | Yoshiro Tamegai | Department of Gastroenterology and Endoscopy, Japanese Foundation for Cancer Research Cancer Institute Hospital |
| Author | Masahiro Igarashi | Department of Gastroenterology and Endoscopy, Japanese Foundation for Cancer Research Cancer Institute Hospital |
| [ Summary ] | Our presentation compared rectal laterally spreading tumors (LSTs) to colonic LSTs. Because endoscopic resection of early rectal cancer can result in a complete cure, treatment has a very beneficial effect on quality of life. The treatment strategy for early colorectal cancer should be divided into categories by site of tumor, rectum, or colon. The total number of LSTs was 848 lesions, including 142 rectal LSTs and 706 colonic LSTs. In the group of rectal LSTs, there were several granular LSTs (nodular mixed type) tumors larger than 30 mm. The malignant potential of granular LST (recurrence or invasive cancer) has a correlation with increasing tumor size. There were only a few rectal non‒granular LST type tumors, but the potential for malignancy of non‒granular LST (T1b or lymphovascular invasion) is high even when the tumor is smaller than 20 mm. In rectal LSTs, endoscopic diagnostic accuracy is 89 %, lower than the 95% accuracy for colonic LSTs. There is a variety of rectal LST lesions detected on endoscopy that are indicated for diagnostic treatment such as a total biopsy. |
|