<prompt> Dysfunction of tympanic membrane is characterized by all except -Normal cone of lightRetracted TMNonprominent umboFullness in middle ear  <response>: Retracted Tympanic BembraneIt is the result of negative intratympanic pressure when Eustachian tube is blockedCharacteristicsIt appears dull and lusterlessQCone of light is absent or interruptedQHandel of malleus appears foreshortened QLateral process of malleus becomes more prominent QAnterior and posterior malleal folds become sickle shaped QIt is immobile or has limited mobility when tested with pneumatic otoscope or siegles speculum.Features of Normal Tympanic MembraneIt is shiny and pearly grey in colourHas concavity on its lateral surfaceCone of light seen in antero inferior quadrantIts transparency variesIt is mobile when tested with pneumatic otoscope or siegles speculum. 