To examine this theory computerized tomographic ct findings of these conditions were evaluated in a series of 53 ears with retractions of the pars flaccida attic retractions.
Attic retraction pocket cholesteatoma.
This is differentiated from an infected retraction pocket of the pars tensa or a retraction pocket cholesteatoma.
This is the most common and widely considered as the main reason for cholesteatoma.
Such causes can include for example poor eustachian tube function which results in retraction of the ear drum and failure of the normal outward migration of skin.
In cholesteatoma first international conference.
Granulation tissue may arise from the mucosa adjacent to the cholesteatoma figure 6c.
Pathophysiology toss theory of invagination.
There has been significant bone erosion of the ear canal wall above the eardrum.
Go to top a skin cyst caused by a long standing retraction pocket of the eardrum into the middle ear.
1977 the significance of the retraction pocket in the treatment of cholesteatoma.
The cyst slowly erodes bone and can cause facial paralysis hearing loss dizziness and if left untreated can slowly erode into the brain cavity.
Skin material often accumulates in this pocket and becomes infected causing drainage and potential severe complications.
Mccabe b sadé j and abramson m.
Persistent negative pressure in the attic region causes invagination of pars flaccida causing a retraction pocket.
Common organisms to infect this keratin debris are psuedomonas e.
Eustachian tube theory.
Often there is an accumulation of squamous debris within the pocket figure 6a b.
Retraction pockets a retraction pocket is an invagination of the tympanic membrane.
It is hypothesized that blockade of the tympanic isthmus causes isolation of the attic and the adjacent middle ear spaces and that subsequent building up of the negative pressure in these spaces results in retraction of the pars flaccida leading to formation of attic retraction pockets and cholesteatomas.
This retraction pocket becomes later filled with desquamated epithelial debris which forms a nidus for the infection to occur later.
Invagination of the tympanic membrane of the attic to form retraction pockets to be filled with desquamated epithelium and keratin to form cholesteatoma.
Although the pathogenesis of acquired cholesteatoma remains controversial the most widely accepted theory is the retraction pocket theory which states that dysfunction of the eustachian tube leads to the buildup of negative pressure in the middle ear such that a segment of the tympanic membrane most commonly the pars flaccida is drawn into the middle ear and becomes sequestered followed by accumulation of the trapped keratin.
Eds aesculapius publishing company birmingham alabama pp.
A retraction pocket seen in the attic or posterosuperior quadrant of a tympanic membrane is the hallmark of an acquired cholesteatoma.
A recurrent cholesteatoma is a new cholesteatoma that develops when the underlying causes of the initial cholesteatoma are still present.
Stratified squamous epithelium may also be present in the middle ear as other clinical or pathological entities such as metaplastic islands of the mucosa in chronic ears with central perforations.
