Colagenous gastritis is characterized by a thick band of collagen immediately beneath the surface epithelium of the gastric mucosa.

In collagenous gastroduodenitis associated with collagenous colitis, the collagen band in the gastric mucosa can be at the level of the foveolar isthmus.

Only rare cases of this entity have been described, and its clinical associations remain unclear.

References

 Vesoulis Z, Lozanski G, Ravichandran P, Esber E. Collagenous gastritis: a case report, morphologic evaluation, and review. Mod Pathol. 2000 May;13(5):591-6. Review. PMID: #10824933#

 Cote JF, Hankard GF, Faure C, Mougenot JF, Holvoet L, Cezard JP, Navarro J, Peuchmaur M. Collagenous gastritis revealed by severe anemia in a child. Hum Pathol. 1998 Aug;29(8):883-6.PMID: #9712433#