The<unk>  Process (XP), is a form of acute and chronic<unk>  characterized by an exuberant clustering of foamy macrophages among other inflammatory cells. Localization in the kidney and renal pelvis has been the most frequent and better known occurrence followed by that in the gallbladder but many others have been subsequently recorded. The pathological findings of the process and etiopathogenetic and clinical observations have been reviewed by Cozzutto and Carbone.
Xanthogranulomatous inflammation
Hypergranulosis
Keratinizing metaplasia
Follicular hyperplasia
Caseous necrosis
Plasma cell granuloma
Necrobiosis
Reticular formation