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Table 2 STR length (anterior-posterior depth) grading

From: Supratubal recess and sinus tympani: CT analysis of middle ear hidden areas

 

Grade 1

Grade 2

Grade 3

Measurement in mm

< 3 mm

3–5 mm

> 5 mm

Number of ears

12

160

28

Percent

6%

80%

14%