Pathology Middle ear mucosa is lined by secretory epithelium forming glandlike structure u Hyalinization or tympanosclerosis A healing response It occurs during quiescent periods It is formed by fused collagenous fibers It is hardened by the deposition of calcium and phosphate crystals Conductive hearing loss is associated with masses restricting ossicular mobility
Pathology ◼ Middle ear mucosa is lined by secretory epithelium forming glandlike structure. ◼ Hyalinization or tympanosclerosis ◼ A healing response ◼ It occurs during quiescent periods ◼ It is formed by fused collagenous fibers ◼ It is hardened by the deposition of calcium and phosphate crystals ◼ Conductive hearing loss is associated with masses restricting ossicular mobility
Pathology Ossicular erosion is frequent in COM a Infection process per se u Necrosis following vascular thrombosis a It most commonly affect the lenticular process of the incus and head of the stapes
Pathology ◼ Ossicular erosion is frequent in COM ◼ Infection process per se ◼ Necrosis following vascular thrombosis ◼ It most commonly affect the lenticular process of the incus and head of the stapes
Pathology Cholesterol granulomas Presence of yellowish masses surrounded by granulation tissue edematous mucosa and fibrous tissue It contains many cholesterol crystals and foreign body giant cells
Pathology ◼ Cholesterol granulomas ◼ Presence of yellowish masses surrounded by granulation tissue, edematous mucosa and fibrous tissue ◼ It contains many cholesterol crystals and foreign body giant cells
Pathology Cholesteatoma; cystlike, expanding lesions of the temporal bone, lined by stratified epithelium and containing desquamated keratin and purulent material Classification Congenital cholesteatoma Acquired cholesteatoma
Pathology ◼ Cholesteatoma: cystlike, expanding lesions of the temporal bone, lined by stratified epithelium and containing desquamated keratin and purulent material. ◼ Classification ◼ Congenital cholesteatoma ◼ Acquired cholesteatoma