Pulse or hyaline ring granuloma. Review of the literature on etiopathogenesis of oral and extraoral lesions
Hyaline ring-like structures are often encountered during microscopic evaluation of inflamed tissues from the oral cavity. The exact etiology remains unknown. Two theories exist. One favors intrinsic origin, most likely collagen, while the other suggests extrinsic origin, vegetable material. The literature is reviewed and histologic features are illustrated.