Objective To investigate endolymphatic hydrosor in patients with different types of unilateral sudden deafness and the relationship with the type of hearing curve and the degree of ear fullness. Methods 20 cases of sudden deafness within 2 weeks of onset were selected

the interlymphatic space of vestibular and cochlea of inner ear was measured on the MRI results of internal auditory canal of all subjects

and the score of ear fullness VAS was compared to statistically analyze the correlation between the two. Results There were 20 cases of unilateral sudden deafness

including 10 cases of left ear and 10 cases of right ear

among which 8 cases（40%

8/20） were accompanied by symptoms of ear fullness. The incidence of ear fullness in low frequency type（80%

4/5） was more than that in flat type（40%

2/5）

in total deafness type（40%

2/5） and in high frequency type（0

0/5）. There was no statistical difference（P>0.05）.2 cases of low frequency sudden deafness had endolymphatic hydros in the vestibular of the affected side

and no endolymphatic hydros was found in the rest. There was no significant difference in the lymphoid ratio between the type of sudden deafness and the vestibular area and cochlea area of the affected side（P>0.05）. Low-frequency patients were more likely to have symptoms of ear fullness

and the degree of ear fullness was correlated with endolymphatic hydros（R=0.622

P<0.05）. Conclusion Endolymphatic hydros exists in patients with sudden deafness

especially in patients with low-tone sensorineural hearing loss. The more severe the degree of ear fullness is

the more severe the degree of endolymphatic hydros may be.