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ATRES images (5) IA - Coggle Diagram
ATRES 
IA
REFERENCES
Lemmerling M, Kollias SS. Radiology of the petrous bone. Springer Verlag. (2004) ISBN:354042394X
Ziev, David. ''Choanal atresia''. PubmedHealth. Retrieved 11 September 2012.
DEFINITION
a lack of a fully developed ear canal, eardrum and middle ear.
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PATHOPHYSIOLOGY
persistance of the tympanic ring results in a bony atresia plate at the level of the tympanic membranes
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