2. NORMAL EARDRUM - tense and devoid of any retained epithelial debris middle elastic layer the normal migration of the epithelial layer from the drum along the meatal walls to the exterior.
3. RETRACTION POCKETS AND ATELECTASIS The 1-st condition: the closing of the Eystachian tube The 2-nd condition: some parts of the eardrum have no elastic layer The pressure inside is negative The pressure outside is positive Impression of the parts of the eardrum and accumulation of debris in it
6. RETRACTION POCKETS Part of the eardrum without elastic layer (atelectasis) Retraction pocket Huge retraction pocket with cholesteatoma
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18. CHOLESTEATOMA Closing the tube The retraction pocket Huge retraction pocket and cholesteatoma Bone destruction and spreading infection into the middle cranium fossa
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20. CHOLESTEATOMA The ingrowth of squamous epithelium around the edges of a perforation , especially in the case of marginal perforations
