小腸悪性腫瘍の診断と治療―原発性上皮性悪性腫瘍（癌腫）

The Primary Small Intestine Cancer

要旨　原発性小腸癌は，まれな疾患で，その発生頻度は全消化管癌の0.6～3.2％とされている．男女比では約2：1と男性に多く，好発年齢は50～60歳代である．発生部位は，空腸ではTreitz靱帯から50cm以内の近位空腸に，回腸では回盲弁より50cm以内の遠位回腸に多く認める．肉眼型は，進行癌では隆起型と潰瘍型に大別され，潰瘍型はさらに非狭窄型，管外発育型，輪状狭窄型に細分類され，短い狭窄が特徴の輪状狭窄型が最も多いとされている．小腸癌はその局在性から早期発見が困難であるが，近年ではダブルバルーン小腸内視鏡やカプセル内視鏡により以前より早期発見が可能となってきており，今後のさらなる展開が期待される．

　The primary small intestine cancer is a rare disease, and the outbreak frequency is considered to be 0.1～0.3％ of all gastrointestinal cancers. Approximately 2 : 1 and a man have many it at the sex ratio, and the predilection age is 50～60 years old. We recognize a lot the outbreak part to distal ileum within 50cm than an ileocecum valve with the ileum to proximal jejunum within 50cm from Treitz ligament with the jejunum. It is classified roughly in a protruded type and an ulcer type for the advanced cancer and it is done subclassification and, as for the ulcer type, is said to a non-stenosis type, an outside the territorial jurisdiction growth type, a circular stenosis model more that with most circular stenosis models characterized by a stenosis having a short it. Early detection is difficult, but in late years early detection is enabled than before, and, as for the small intestine cancer, further development in the future is expected from the localization by a double balloon small intestine endoscopy and a capsule endoscopy.