Erschienen in:
01.12.2003 | Letters to the Editor
To the Editor (DOI: 10.1007/s00268-003-7225-z)
verfasst von:
D. Paul Hurlstone
Erschienen in:
World Journal of Surgery
|
Ausgabe 12/2003
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Excerpt
Superficial spreading type colorectal tumors, now referred to as lateral spreading tumors (LSTs) of the colorectum, are well described in both the Japanese and Western literature [
1,
2]. Two distinct types of LST exist, both of which are characterized by their endoscopic morphology [
1]. F-type lesions are superficial spreading lesions with a flat “creeping” endoscopic morphology, and G-type lesions comprise spreading nodular aggregates, which are flat and broad-based with an uneven surface [
1]. LSTs larger than 20 mm in diameter, in particular those of G-type morphology demonstrate a low invasive rate in view of their large size and are commonly restricted to submucosal layers 1–3, without breach of the muscularis propria (i.e., T1 lesions) [
3]. The risk of lymph node metastasis in this tumor category is less than 5% [
4]. Such lesions can therefore be effectively managed by endoscopic mucosal resection (EMR) [
1] rather than open surgical resection as first-line management. …