Calcification of the tympanic membrane (eardrum) can be classified based on quadrant distribution.
Exam: The tympanic membrane is divided into 4 quadrants: anterior superior, posterior superior, anterior inferior and posterior inferior.
There are 16 possible combinations for calcifications in the various quadrants.
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Calcifications
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Type
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none
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Type 0
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calcifications in both superior quadrants
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Type I
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calcifications in only one of the superior quadrants
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Type II
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Types I and II may have calcifications in the lower quadrants.
