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要旨 好酸球性消化管疾患の病理組織学的特徴を探るため,好酸球性食道炎が疑われた食道生検組織12例34切片,好酸球性胃腸炎を疑われた5例30切片と,粘膜への好酸球浸潤を伴いやすいNSAID腸炎1例3切片,collagenous colitis 1例9切片,寛解期の潰瘍性大腸炎1例12切片において,上皮内ならびに粘膜間質内に浸潤する好酸球数,およびその浸潤パターンや組織の反応性変化,他の炎症性細胞の浸潤程度などを観察評価した.結果,好酸球性食道炎とみなしうる生検組織の特徴は,(1)上皮内に30~40/HPFを超える高度な好酸球浸潤があること,(2)浸潤する好酸球は上皮表層優位に,比較的斑状に,あるいは集簇巣を形成して存在すること,(3)上皮は炎症により浮腫を来し,時に上皮の落屑を伴うこと,(4)上皮基底細胞の反応性過形成を示すことの4点にまとまった.一方,好酸球性胃腸炎における粘膜組織の特徴は,食道炎ほど明確にはまとまらなかったが,食道炎同様,上皮に好酸球浸潤を認めることがひとつの特徴と考えられた.加えて,粘膜間質に20/HPFを超える好酸球が浸潤し,リンパ球や形質細胞など他の炎症性細胞の比較的密な浸潤を伴うこともその特徴のひとつと考えられた.
The aim of this description is to find some histological features of EGID(eosinophilic gastrointestinal disorders). We examined 34 esophageal biopsy specimens from 12 patients suspected to have EE(eosinophilic esophagitis), 30 gastrointestinal biopsy specimens from 5 patients suspected to have EGE(eosinophilic gastroenteritis), 3 intestinal biopsy specimens from one patient with NSAID enteritis, 9 ileocolonic biopsy specimens from one patient with collagenous colitis and 12 gastrointestinal biopsy specimens from one patient with remission phase ulcerative colitis. We observed and evaluated the phenomenon that many eosinophils infiltrate the mucosal epithelium and the mucosal lamina propria. We also evaluated mucosal epithelial reaction and other cases of inflammatory infiltration.
The result indicated that histological features in EE can be summarized in the following four points : 1)more than 30-40/HPF eosinophils infiltrate the squamous epithelium, 2)eosinophils showed patchy infiltration and degranulation predominantly within the superficial epithelium, 3)epithelium showed edema and desquamated squamous cells, 4)basal cell hyperplasia was also a frequent finding.
In contrast, although the histological features of EGE are not as clear as those of EE, eosinophilic intraepithelial infiltration might be one of the features of EGE, as it is also of EE. In addition, it could be said that one of the features of EGE, that of eosinophilic infiltration exceeding 20/HPF in the lamina propria predominantly in the deep portion of the mucosa or muscularis mucosae, is accompanied by dense lympho-plasmacytic infiltration.
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