HRCT manifestations of cochlear aqueduct in normal infants and differences of diameters with sensorineural hearing loss / 中国医学影像技术

ABSTRACT

Objective To observe HRCT features of cochlear aqueduct (CA) in normal infants,and to explore the differences of CA diameters between sensorineural hearing loss (SNHL) infants and normal infants.Methods Totally temporal bone HRCT data of 129 infants without abnormal hearing (258 ears) were taken as control group,while temporal bone CT data of 58 infants (116 ears) diagnosed as sensorineural hearing loss (SNHL) with normal inner ear structure were collected as SNHL group.Infants in both 2 groups were divided into 1-year,2-year and 3-year subgroups.The width of external aperture and length of CA were measured,and the results were statistically analyzed.Results In normal group,CA diameters and the width of external aperture had no statistical differences between sides and genders (both P＞0.05).There was no statistical difference of CA diameters between the same subgroup in 2 groups (t=0.160,0.979,0.432,all P＞0.05),but the width of CA external aperture in subgroups of SNHL group was smaller than those of normal group (t=3.722,3.101,3.336,all P＜0.01).Conclusion The length of CA and width of external aperture increase with age,and there may be relationship between smaller width of CA external aperture and SNHL.