Clinical practice cholesteatoma diagnosing the unsafe ear 634 reprinted from australian family physician vol.
Cholesteatoma attic retraction.
Skin material often accumulates in this pocket and becomes infected causing drainage and potential severe complications.
A primary acquired cholesteatoma results from tympanic membrane retraction.
5 ruedi s theory.
The basal cells of germinal layer of skin proliferate under the influence of infection and lay down keratinising squamous epithelium.
The negative middle ear pressure which is the cause of retraction pocket toss classified attic retraction pockets into 4 grades.
Cholesteatoma is an accumulation of squamous epithelium and keratin debris that usually involves the middle ear and mastoid.
Invagination of tympanic membrane from the attic or part of pars tensa in the form of retraction pockets lead to the formation of cholesteatoma.
Acquired cholesteatomas makeup 98 of all middle ear cholesteatomas and are almost always closely related to the tympanic membrane from which most are thought to arise.
Eustachian tube theory.
Invagination of the tympanic membrane of the attic to form retraction pockets to be filled with desquamated epithelium and keratin to form cholesteatoma.
Clinical presentation the vast majority of acquired cholesteatomas develo.
This is the most common and widely considered as the main reason for cholesteatoma.
8 august 2008 a retraction pocket seen in the attic or posterosuperior quadrant of a tympanic membrane is the hallmark of an acquired cholesteatoma.
Although benign it may enlarge and invade adjacent bone.
Often presents with a malodorous ear discharge with associated hearing loss.
The pars flaccida is not in contact with the neck of the malleus.
1 attic retraction pocket cholesteatoma is clearly visualized white arrow.
There has been significant bone erosion of the ear canal wall above the eardrum.
The classic case develops from progressively deeper medial retraction of the pars flaccida into the epitympanum attic.
As this process continues the lateral wall of the epitympanum the scutum is slowly eroded producing a defect in the lateral wall of the.
Retraction pockets a retraction pocket is an invagination of the tympanic membrane.
Stratified squamous epithelium may also be present in the middle ear as other clinical or pathological entities such as metaplastic islands of the mucosa.
Often there is an accumulation of squamous debris within the pocket.
This is differentiated from an infected retraction pocket of the pars tensa or a retraction pocket cholesteatoma.
