TympanosclerosisPathogenesis : PastOM, dry ear, large CPhearing loss, tinnitus,bilat.o/e-whitechalkypatches inpars tensa,ME,decreasemobilityTreatment :Difficult,for hearingMyringoplastystapedectomy,ossiculoplasty16
16 Tympanosclerosis ⚫ Pathogenesis : Past OM, dry ear, large CP ⚫ Clinical features : hearing loss, tinnitus, bilat. o/e – white chalky patches in pars tensa, ME, decrease mobility, Treatment : ⚫ Difficult, for hearing ⚫ Myringoplasty, stapedectomy, ossiculoplasty
Otospongiosis(otosclerosis)Common,hereditary localized diseaseofbonederivedfromoticcapsuleMaturelamellarboneremoved byosteoclasis&replaced byunorganized woven boneof greaterthickness,cellularity,andvascularityTypes -1Nonclinical (histological)-commonest2 clinical -mixed, stapedial, cochlear17
17 Otospongiosis (otosclerosis) ⚫ Common, hereditary localized disease of bone derived from otic capsule ⚫ Mature lamellar bone removed by osteoclasis & replaced by unorganized woven bone of greater thickness, cellularity,and vascularity ⚫ Types – 1 Nonclinical (histological) – commonest 2 clinical – mixed, stapedial, cochlear