最后两张应该是AB-PAS吧？确实非常罕见！

如此重的炎症（淋巴细胞及浆细胞浸润明显），杯状细胞的增生也比较显著（对儿童的胃粘膜的细胞构成不是很熟悉，不知道与成人有没有区别？），看不明白了，猜一个吧：淀粉样瘤（免疫反应性淀粉样变）？！

It is not a straightforward case.

I still would like to ask where were the biopsies taken from? I would not have recognized this as stomach if you had not told me it was.  If it was from the stomach, 先天性粘膜异位+炎症性病变 as suggested by 第 18 楼 + 第 20 楼.

It looks like  an inflammatory lesion with plasma cells, lymphocytes, histiocytes, neutrophils and eosinophils.  I don't think it is neoplastic although there are intraepithelial inflammatory cells, they do not appear to be particularly destructive.  I favor an autoimmune or allergic process than an infectious process, among others. I had trouble reading many of the slides off the terminal.  Is the structure being highlighted on the fourth row on the right a multinucleated giant cell or are those multiple individual cells?  What were the endoscopic findings?  I suspect it was diffuse erythema and hemorrhage with no mass lesions.  Any lower GI symptoms? 

I like the suggestions made by 第 19 楼:  "非常需要了解临床具体情况：如有无感染、过敏、用药、胆汁返流、炎性肠病等情况."

It looked like the PAS stain did not highlight microorganisms.   If it is neoplastic (again unlikely) a T-cell process would be at the top of my list. 

全胃粘膜发育异常，看来还是与遗传缺陷有关，这是一个值得遗传病理学研究的病例。请见另一处的介绍：

需排除乙酰水杨酸胃损伤后（嗜酸性细胞较少，暂不考虑此），个人考虑胃粘膜的 幼年性息肉。

原因：1、潴留性腺上皮。

             2、轻-重度的炎症浸润，以至于克罗恩氏改变，炎症细胞以单核细胞为主要。

             3、炎症细胞浸润常呈冠帽样，即越靠近表面粘膜炎症细胞浸润越明显。

            4、疏松的纤维血管间索。